wria 23 chapter includes: chehalis river prairie creek ...€¦ · date time temp c ph do mg/l cond...

Chehalis Watershed WRIA 23 Chapter Includes: Chehalis River Prairie Creek Scatter Creek Skookumchuck River

Chehalis River #0190

PART OF CHEHALIS WATERSHED LENGTH OF RIVER: 126 miles BASIN SIZE: 2,660 square miles PRIMARY LAND USES: In Thurston County, the land uses are primarily agriculture, rural residential, and forest land. The small communities of Rochester and Grand Mound are located within the Chehalis drainage basin. FISHERIES RESOURCES: (From A Catalog of Washington Steams and Salmon Utilization, WDOF) Coho, Chum, Chinook GENERAL TOPOGRAPHY: The Chehalis River basin is the second largest river basin in Washington outside the Columbia River basin. The basin includes forested headwaters in the Gifford Pinchot and Olympic National Forests as well as private timber lands. The river

discharges into the Pacific Ocean via Grays Harbor in the Aberdeen area. GENERAL WATER QUALITY: Good – pH standard violation in 04-05. Summer high temperatures occur, which are a natural condition. OTHER DATA: Washington State Department of Ecology, Environmental Assessment Program (360) 407-6000. Thurston County Environmental Health Division (360) 754-4111 (water quality data for 1991-1993) or www.geodata.org/swater Thurston County Department of Water and Waste Management, (360) 357-2491 (flow data from 1992) or www.co.thurston.wa.us/monitoring

138

Chehalis River #0190

Discussion: This is the ninth year for monitoring the Chehalis River as part of the ambient monitoring program. It is monitored at the Independence Road bridge, which is at river mile 54. There is water quality data for the Chehalis at Prather Road for 1996-1998, on the web site at www.geodata.org/swater. There was one slight violation of the pH standard in December 2004. Temperatures recorded in July and August have been high. This is an indication that there are likely violations of the temperature standard during the summer months. Fecal coliform standards were met for Part I and Part II of the standard for the past two water years. The Washington Department of Ecology conducted a total maximum daily load study to address the water quality problems in the Chehalis River in the 1990’s. Major Issues: # During summer low-flow conditions, high water temperatures and low dissolved oxygen

levels exist. # Non-point pollution from rural land-uses and point discharges to the river in the Centralia

and Chehalis area contributes to water quality problems. Funding Sources: # Thurston County

139

Water Quality Summary Conventional Parameters

Chehalis River at Independence Road

Water Year Data:

2003/04 and 2004/05 Cumulative Data:

1996-2003 Parameter Units WQ Standard WAC 173-201A Water

Year Mean Range # samples violating standard Mean Range

Temperature EC Highest 7-DAD Max of 17.5EC

03/04 04/05 6.78 – 20.53

3.94 – 20.04 4.04 - 20.88

Dissolved Oxygen mg/L Lowest one-day minimum of 8.0

03/04 04/05 9.01 – 12.49

9.58 - 12.9 0 of 9 0 of 12 8.04 - 13.3

Conductivity Fmhos/cm 03/04 04//05

98 99

80 - 114 77 – 122 86 42 – 136

pH 6.5 - 8.5 03//04 04/05

7.3* 7.2*

7 - 7.7 6.4 – 7.7

0 of 9 1 of 12 7.2* 6.5 – 7.7

Turbidity NTU not to exceed 5

NTU over background

03/04 04/05

3.81 4.10

0.3 – 9.1 0.2 – 11.2

0 of 9 0 of 12 13.5 1.0 - 228

% exceeding 200 41** 0 - 1600 Fecal Coliform colonies /

100 ml

GMV: < 100 and < 10% not to exceed 200

03/04 04/05

17** 18**

0 - 50 0 - 105 0%

0%

Total Phosphorus mg/L 03/04 04/05

0.039 0.042

0.023 - 0.075 0.028 - 0.074 0.06 0.02 - 0.58

Nitrate + Nitrite-nitrogen mg/L 03/04

04/05 0.625 0.658

0.455 - 0.787 0.457 - 0.879 0.745 0.505 – 1.06

Ammonia mg/L 0.069 0.012 - 0.274 * Median ** Geometric mean value (GMV)

Chehalis R

iver #0190_______________________________________________________________________________

140

Date Time TempC

pH DO mg/L

Cond @25c umhos/cm

FC cfu/100mL

Turb NTU

TP mg/L

NOx mg/L

COMMENTSFlow cfs

Chehalis River @ Independence RdThurston County Water Resources Monitoring Report 2003 - 2004

12/17/2003 11:40:00 AM 6.78 7.0 11.98 82 30 0.039 USGS flow data9.1 7630.0 0.787

1/20/2004 12:30:00 PM 7.52 7.2 12.48 80 45 0.033 USGS flow data5.1 3680.0 0.760

2/18/2004 12:10:00 PM 6.86 7.0 12.05 88 20 0.043 USGS flow data7.0 4270.0 0.747

3/16/2004 11:20:00 AM 9.32 7.2 12.49 94 20 0.023 USGS flow data2.6 1700.0 0.620

4/20/2004 12:00:00 PM 11.10 7.7 11.27 108 10 0.033 USGS flow data2.2 1320.0 0.479

5/17/2004 1:00:00 PM 16.01 7.5 12.02 108 0 0.025 DO-122% saturation. F.C. result = <5. USGS flow data1.5 793.0 0.455

7/14/2004 11:00:00 AM 20.53 7.4 9.83 114 30 0.044 USGS flow data0.3 293.0 0.596

8/25/2004 12:10:00 PM 19.26 7.4 9.01 112 50 0.075 Raining ~68. USGS flow data1.5 664.0 0.602

9/21/2004 1:10:00 PM 12.82 7.3 11.43 97 10 0.033 USGS flow data5.0 1740.0 0.580

Chehalis R

iver #0190_______________________________________________________________________________

141

Date Time TempC

pH DO mg/L

Cond @25c umhos/cm

FC cfu/100mL

Turb NTU

TP mg/L

NOx mg/L

COMMENTSFlow cfs

Chehalis River @ Independence RdThurston County Water Resources Monitoring Report 2004 - 2005

10/20/2004 12:45:00 PM 11.46 6.9 10.34 93 105 0.056 USGS flow data.8.1 3230.0 0.576

11/10/2004 11:15:00 AM 8.81 6.9 11.50 94 20 0.028 USGS flow data2.6 1390.0 0.529

12/15/2004 11:15:00 AM 8.41 6.4 11.61 86 35 0.044 Sampled off bridge. USGS flow data.11.2 5180.0 0.783

1/13/2005 11:15:00 AM 3.94 6.6 11.91 90 15 0.034 USGS flow data.3.4 1950.0 0.650

2/16/2005 10:30:00 AM 4.57 7.2 12.94 94 10 0.030 USGS flow data.2.7 1290.0 0.703

3/16/2005 1:15:00 PM 10.58 7.3 10.69 107 0 0.038 F.C. result is <5. USGS flow data.1.4 601.0 0.628

4/13/2005 11:30:00 AM 8.38 7.2 11.32 77 45 0.045 Cloudy, 45 degrees. USGS flow data.6.7 3820.0 0.651

5/11/2005 12:30:00 PM 12.78 7.2 10.55 98 25 0.074 Overcast ~ 60 degrees. USGS flow data.9.7 3350.0 0.457

6/8/2005 12:00:00 PM 14.84 7.4 10.58 98 20 0.033 USGS flow data.1.9 856.0 0.541

7/13/2005 11:15:00 AM 17.15 7.4 9.58 102 35 0.036 USGS flow data.0.5 591.0 0.656

8/8/2005 11:45:00 AM 20.04 7.7 10.38 121 10 0.029 Turb standard recall of lot used to cal YSI on this date. Results could be up to 8% lower than the true turb value. USGS flow data.

0.2 245.0 0.846

9/28/2005 12:30:00 PM 14.74 7.5 10.33 122 10 0.054 Turb standard recall of lot used to cal YSI on this date. Results could be up to 8% lower than the true turb value. USGS flow data.

0.8 229.0 0.879

Chehalis R

iver #0190_______________________________________________________________________________

142

Prairie Creek #0729

PART OF CHEHALIS WATERSHED LENGTH OF CREEK: 5.5 miles BASIN SIZE: Undetermined STREAM ORDER: 2 PRIMARY LAND USES: Rural Residential Agriculture FISHERIES RESOURCES: (From A Catalog of Washington Streams and Salmon Utilization, WDOF) Coho and Chum GENERAL TOPOGRAPHY: Moderately sloped forested headwaters, middle and lower basins are predominantly

prairie with slopes less than 15%. Stream gradient is fairly low. Portions of the stream lose water to the groundwater, due to the extremely porous nature of prairie soils in the area. The creek is dry during the summer months at the sampling station off Old Highway 9. GENERAL WATER QUALITY: (Excellent, Good, Fair, Poor) Good. Two pH measurement were outside of the water quality standard in 2004/05. Nitrate values are often elevated in this creek. OTHER DATA: Thurston County Environmental Health Division, (360) 754-4111, www.geodata.org/swater

143

Prairie Creek #0729 Discussion: The Thurston County Health Department has been monitoring Prairie Creek since March 1996. Prairie is a seasonal creek and does not flow in the summer months. During March monitoring the creek was not flowing due to low rainfall in February. The creek is primarily groundwater fed. Nitrate levels were lower in water years 2003/04 and 2004/05 than in past years. The lower nitrate levels are most likely the result of less groundwater pollution due to drought conditions. Water quality monitoring will continue. Funding Sources: # Thurston County

144


Prairie Creek

Water Year Data: 2003/04 and 2004/05

Cumulative Data: 1996-2003 Parameter Units

WQ Standard WAC 173-201A

Water Year Mean Range # samples violating

standard Mean Range

Temperature �C Highest 7-DAD Max of 17.5�C

03/04 04/05 5.21 – 10.1

2.24 – 13.2 2.67 - 11.46

Dissolved Oxygen mg/L Lowest one-day

minimum of 8.0 03/04 04/05 11.6 – 14.01

8.33 – 14.3 0 of 5 0 of 7 9.98 – 13.4

Conductivity �mhos/cm 03/04 04/05

50 58

46 – 55 48 – 78 46 38 – 74

pH 6.5 - 8.5 03/04 04/05

7.0* 6.9*

6.7 - 7.7 6.3 - 7.1

0 of 5 2 of 7 6.8* 5.8 – 7.9


NTU over background

03/04 04/05

3.30 4.80

2.4 – 4.2 3.1 – 6.9

0 of 5 0 of 7 7.12 3.6 - 28

% exceeding 200 Fecal Coliform

colonies / 100 ml

GMV: <100 and < 10% not to exceed 200

03/04 04/05

18** 25**

5 – 95 10 – 145 0%

0% 31** 0 - 460

Total Phosphorus mg/L 03/04

04/050.044 0.061

0.028 - 0.0790.031 - 0.128 0.04 0.001 - 0.161

Nitrate + Nitrite-nitrogen

mg/L 03/04 04/05

0.655 0.295

0.065 - 1.2 0.049 – 1.04 1.027 0.222 - 2.07

* Median ** Geometric mean value (GMV)

Prairie Creek #0729

_______________________________________________________________________________

145

Date Time TempC

pH DO mg/L

Cond @25c umhos/cm

FC cfu/100mL

Turb NTU

TP mg/L

NOx mg/L

COMMENTSFlow cfs

Prairie Creek @ Old Hwy 9Thurston County Water Resources Monitoring Report 2003 - 2004

12/17/2003 10:40:00 AM 5.21 6.7 11.77 49 15 0.034 A bit of foam up and downstream4.2 14.9 1.200

1/20/2004 11:15:00 AM 6.92 7.3 11.60 47 5 0.0283.8 8.0 0.881

2/18/2004 12:45:00 PM 6.68 7.0 12.24 46 20 0.0343.4 12.2 0.902

3/16/2004 11:50:00 AM 9.42 7.7 14.01 51 10 0.044 122% DO Saturation. A lot of aquatic moss seen downstream of bridge.

2.7 2.1 0.227

4/20/2004 11:00:00 AM 10.10 7.2 12.04 55 95 0.0792.4 1.3 0.065

Prairie Creek #0729

_______________________________________________________________________________

146

Date Time TempC

pH DO mg/L

Cond @25c umhos/cm

FC cfu/100mL

Turb NTU

TP mg/L

NOx mg/L

COMMENTSFlow cfs

Prairie Creek @ Old Hwy 9Thurston County Water Resources Monitoring Report 2004 - 2005

10/20/2004 11:40:00 AM 11.18 6.3 8.33 78 145 0.1285.3 2.5 0.049

11/10/2004 10:15:00 AM 8.43 6.5 9.74 62 10 0.0663.1 1.5 0.073

12/15/2004 12:11:00 PM 7.07 6.4 11.20 53 15 0.037 Silvers spawning, only 1 or 2 in our area.6.9 10.5 1.040

1/13/2005 12:00:00 PM 2.86 6.9 12.09 51 15 0.037 35 F.4.5 4.8 0.319

2/16/2005 11:20:00 AM 2.24 7.1 14.28 53 30 0.0334.0 1.8 0.199

4/13/2005 10:30:00 AM 7.76 7.0 12.33 48 15 0.0313.6 5.5 0.259

5/11/2005 11:05:00 AM 13.20 6.9 9.70 58 30 0.0976.2 9.7 0.123

Prairie Creek #0729

_______________________________________________________________________________

147

Scatter Creek #0716

PART OF CHEHALIS WATERSHED LENGTH OF CREEK: 20.6 miles BASIN SIZE: 43 square miles STREAM ORDER: 3 PRIMARY LAND USES: Rural Residential Agriculture FISHERIES RESOURCES: (From A Catalog of Washington Streams and Salmon Utilization, WDOF) Coho, Chum, Cutthroat GENERAL TOPOGRAPHY: Moderately sloped forested headwaters, middle and lower basins are predominantly prairie with slopes less than 15 percent. Stream gradient is fairly low. Portions of the stream are losing reaches to the groundwater system, due to the extremely porous nature of soils in the area.

GENERAL WATER QUALITY: (Excellent, Good, Fair, Poor) Good – The creek met both parts of the fecal coliform standard and other water quality standards in both water years, but has elevated nitrates in the lower reaches. OTHER DATA: Washington State Department of Ecology SWRO (360) 407-6000 (Ground water level data 1981-1986, Ground water quality data 1989-1990, Stream flow data 1981-1990). Thurston County Environmental Health Division (360) 754-4111 (Surface and groundwater quality data). www.geodata.org/swater Thurston County Department of Water and Waste Management, Storm Water Utility (360) 357-2491 or www.co.thurston.wa.us/monitoring

148

Scatter Creek #0716

2002-2003 Mean Comparisons at Two Monitoring Stations

Conventional Water Quality Parameters

Parameter

Gibson Road Site

James Road Site

Water Year 2002-2003

Water Year 2002-2003

Conductivity (umhos/cm) 78 130

pH** 6.8 7.5

Turbidity (NTU) 1.9 2.4

Fecal Coliform * (org/100ml)

24 23

Total Phosphorus (mg/l) 0.082 0.089

Nitrate-Nitrite (mg/l) 0.770 2.2

* The mean shown is a geometric mean. **pH mean value shown is a median.

Average Nitrate Levels in Scatter Creek

00.5

11.5

22.5

33.5

4

93/94

94/95

95/96

96/97

97/98

98/99

99/00

00/01

01/02

02/03

03/04

04/05

Water Year

mg/

L ni

trate

149

Scatter Creek #0716 The Health Department began monitoring Scatter Creek in September 1993. The station farthest downstream is at James Road near Scatter Creek’s confluence with the Chehalis River. The upper-most site is at the Gibson Road crossing on Violet Prairie. Monitoring at the Gibson Road site was discontinued after December 2004. The raw data from the two stations for water year 2003/04 and 2004/05 are included at the end of this section. The table on the previous page summarizes and compares mean data from the upstream and down-stream stations in 2002/03. High nitrate concentrations characterize the lower reaches of the creek, while nitrate values upstream at Gibson Road are typically an order of magnitude lower (<1 mg/l). The graph on the previous page shows the average annual nitrate levels at the James Road site since sampling began in 1993. The high nitrate levels are a reflection of the groundwater quality in the area. Major Issues: # Non-point source pollution from agriculture, septic systems, and rural residential land uses. # Habitat loss from sedimentation and reed canary grass infestations. # Native riparian vegetation is lacking in some areas Funding Sources: # Thurston County

150


Scatter Creek at James Road

Water Year Data: 2003/04 and 2004/05

Cumulative Data: 1993-2003

Parameter Units WQ Standard

WAC 173-201A Water

Year Mean Range # samples violating standard

Mean Range

Temperature EC Highest 7-DAD Max of 17.5° C

03-0404-05 5.7 – 16.72

4.27 – 15.970 of 9 0 of 12 4.21 - 17.4


minimum of 8.0 03-0404-05 9.9 – 12.75

9.96 – 13.5 0 of 9 0 of 12 9.04 - 13.5

Conductivity Fmhos/cm 03-0404-05

137 161

79 - 184 113 – 195 123 61 – 198

pH 6.5 - 8.5 03-0404-05

7.5* 7.9*

6.9 – 8.2 6.7 – 8

0 of 9 0 of 12 7.6* 6.6 - 8.3


NTU over background

03-0404-05

1.3 1.4

0.5 – 3.5 0.2 – 3.7

0 of 9 0 of 12 2.2 0 - 9.0

% exceeding 200Fecal Coliform colonies/

100 ml


03-0404-05

32** 41**

10 - 160 0 – 120 0%

0% 28** 0 – 350

Total Phosphorus mg/L 03-04

04-050.047 0.074

0.032 - 0.0740.04 - 0.143 0.100 0.02 - 0.590

Nitrate + Nitrite-nitrogen mg/L 03-04

04-052.28 2.60

0.825 – 3.2 1.74 – 3.55 2.61 0.726 - 7.57


Scatter Creek #0716

_______________________________________________________________________________

151

Water Quality Summary Conventional Parameter

Scatter Creek at Gibson

Water Year Data: 2003/04

Cumulative Data: 1993-2003


WAC 173-201A Water


Mean Range

Temperature EC Highest 7-DAD Max of 17.5° C 03-04 6.31 – 10.1 0 of 5 4.6 – 20.29


minimum of 8.0 03-04 10.48 – 11.44 0 of 5 2.4 – 12.8

Conductivity Fmhos/cm 03-04 91 79 - 99 81 56 – 104

pH 6.5 - 8.5 03-04 7* 6.9 – 7.4 0 of 5 7* 6.4 – 7.8


NTU over background

03-04 1.22 0.4 – 1.9 0 of 5 3.16 0.7 – 15

% exceeding 200Fecal Coliform colonies/

100 ml


03-04 16** 5 - 115 0%

28** 0 – 2015

Total Phosphorus mg/L 03-04 0.028 0.022 - 0.035 0.05 0.008 - 0.540

Nitrate + Nitrite-nitrogen mg/L 03-04 1.11 0.868 – 1.27 0.640 <0.005 – 1.21


Scatter Creek #0716

_______________________________________________________________________________

152

Date Time TempC

pH DO mg/L

Cond @25c umhos/cm

FC cfu/100mL

Turb NTU

TP mg/L

NOx mg/L

COMMENTSFlow cfs

Scatter Creek @ James RdThurston County Water Resources Monitoring Report 2003 - 2004

12/17/2003 11:10:00 AM 5.70 6.9 11.99 79 30 0.054 Salmon - Chum & Chinook. Foam upstream.3.5 83.7 0.825

1/20/2004 11:50:00 AM 7.91 7.1 11.87 98 60 0.0321.2 77.6 1.850

2/18/2004 12:30:00 PM 7.75 7.1 11.96 110 10 0.0421.6 99.3 2.840

3/16/2004 11:45:00 AM 9.62 7.6 12.75 129 25 0.0391.7 45.4 2.870

4/20/2004 11:30:00 AM 10.60 8.2 12.75 139 15 0.0430.8 26.0 2.280

5/18/2004 11:30:00 AM 15.17 7.8 10.68 165 30 0.0371.0 15.5 2.570

7/14/2004 10:30:00 AM 16.72 7.5 9.91 172 45 0.0470.5 17.6 2.910

8/25/2004 11:45:00 AM 14.73 7.4 9.90 156 160 0.0740.6 18.3 3.200

9/21/2004 1:30:00 PM 12.54 7.6 12.33 184 15 0.0530.8 14.1 1.130

Scatter Creek #0716

_______________________________________________________________________________

153

Date Time TempC

pH DO mg/L

Cond @25c umhos/cm

FC cfu/100mL

Turb NTU

TP mg/L

NOx mg/L

COMMENTSFlow cfs

Scatter Creek @ Gibson RdThurston County Water Resources Monitoring Report 2003 - 2004

12/17/2003 10:25:00 AM 6.31 7.0 10.62 79 10 0.0231.4 0.868

1/20/2004 10:55:00 AM 8.26 7.4 11.24 89 5 0.0220.9 1.130

2/18/2004 1:30:00 PM 8.02 6.9 10.67 89 10 0.0351.9 1.230

3/16/2004 12:45:00 PM 9.72 7.3 11.44 99 10 0.0301.5 1.270

4/20/2004 10:30:00 AM 10.10 6.9 10.48 98 115 0.0310.4 1.060

Scatter Creek #0716

_______________________________________________________________________________

154

Date Time TempC

pH DO mg/L

Cond @25c umhos/cm

FC cfu/100mL

Turb NTU

TP mg/L

NOx mg/L

COMMENTSFlow cfs

Scatter Creek @ James RdThurston County Water Resources Monitoring Report 2004 - 2005

10/20/2004 12:10:00 PM 11.10 7.1 10.98 179 120 0.1000.9 9.9 2.600

11/10/2004 10:45:00 AM 9.12 6.9 11.39 194 0 0.086 Staff gage has been moved forward, not accurate. F.C. result is <5.

0.8 12.9 3.030

12/15/2004 12:10:00 PM 7.76 6.7 12.03 120 30 0.077 Silvers spawning; didn't do flow. Several pair.3.7 1.740

1/13/2005 11:30:00 AM 4.99 7.0 12.30 163 25 0.143 35 F.1.4 18.3 2.490

2/16/2005 10:50:00 AM 4.27 7.8 13.46 138 60 0.0602.2 27.7 1.950

3/16/2005 12:45:00 PM 9.46 8.0 11.59 174 35 0.080 Raining.1.8 15.6 2.680

4/13/2005 11:00:00 AM 8.81 7.9 12.18 113 105 0.0431.8 52.0 1.744

5/11/2005 12:00:00 PM 12.69 7.8 11.84 125 30 0.0581.5 36.5 2.150

6/8/2005 11:15:00 AM 13.60 7.8 10.67 152 65 0.0400.7 21.4 2.340

7/13/2005 10:40:00 AM 14.67 7.8 9.96 188 120 0.0580.4 22.4 3.425

8/8/2005 11:15:00 AM 15.97 7.8 10.11 195 65 0.063 Turb standard recall of lot used to cal YSI on this date. Results could be up to 8% lower than the true turb value.

0.2 17.8 3.550

9/28/2005 12:00:00 PM 12.49 7.9 11.13 194 65 0.080 Turb standard recall of lot used to cal YSI on this date. Results could be up to 8% lower than the true turb value.

1.0 13.7 3.450 Scatter Creek #0716

_______________________________________________________________________________

155

Date Time TempC

pH DO mg/L

Cond @25c umhos/cm

FC cfu/100mL

Turb NTU

TP mg/L

NOx mg/L

COMMENTSFlow cfs

Scatter Creek @ Gibson RdThurston County Water Resources Monitoring Report 2004 - 2005

12/15/2004 12:30:00 PM 8.11 6.4 10.18 85 50 0.0292.2 0.718

Scatter Creek #0716

_______________________________________________________________________________

156

Skookumchuck River #0761

PART OF CHEHALIS WATERSHED LENGTH OF CREEK: 21.9 miles to dam BASIN SIZE: 181 square miles STREAM ORDER: 4 PRIMARY LAND USES: Commercial Forestry Rural Residential Agriculture FISHERIES RESOURCES: (From A Catalog of Washington Streams and Salmon Utilization, WDOF) Chinook, Coho, Chum, Steelhead GENERAL TOPOGRAPHY:

Moderately to steep sloped forested headwaters; prairie, alluvial valley, and rolling hills in the middle and lower basin. A dam located in the upper watershed controls downstream flow to some degree. GENERAL WATER QUALITY: (Excellent, Good, Fair, Poor) Good. Met all water quality standards for water year 2003/04 and 2004/05 except for a slight pH violation in October 2004. OTHER DATA: Luis Fuste, U.S. Geological Survey, Tacoma, WA (253) 428-3600, stream flow data. Thurston County Environmental Health Division, (360) 754-4111. www.geodata.org/swater.

157

Skookumchuck River #0761

The Thurston County Health Department monitored the river during the period from 1982-1985 in response to concerns about high bacteria levels found in the river at Schafer park by the Lewis County Health Department. Monitoring began again on the river in September 1993 at five locations between the Highway 507 bridge, southwest of Bucoda and the Skookumchuck Dam near Bloody Run Creek. The number of sites was reduced to two in March 1996; the downstream site at Highway 507 (aka USGS Gage or SKOSK0000), and an upstream site near Coal Street (SKOSK0020). Beginning in water year 1999-2000, monitoring was further reduced to one location at the Highway 507 bridge. This site is now sampled monthly. Flows reported are from the USGS gage located just downstream of the sampling site. The river met the water quality standards during these recent two years with the exception of one low pH measurement. Monitoring will continue as funding is available. Major Issues: # Non-point source pollution # Habitat loss from erosion and sedimentation # Native riparian vegetation is lacking is some areas Funding Sources: # Thurston County

158


Skookumchuck River at USGS gauge

Water Year Data:

2003/04 and 2004/05 Cumulative Data: 1993-2003


WAC 173-201A Water


Mean Range

Temperature EC Highest 7-DAD Max of 17.5EC

03/04 04/05 6.48 – 16.65

4.84 – 14.5 0 of 9 0 of 12 3.97- 17.03


minimum of 8.0 03/04 04/05 9.1 – 13.31

9.99 – 13 0 of 9 0 of 12 9.14 – 14.4

Conductivity Fmhos/cm 03/04 04/05

62 68

55 - 69 59 – 73 56 42 – 77

pH 6.5 - 8.5 03/04 04/05

7.4* 7.2*

6.9 - 7.7 6.4 - 7.6

0 of 9 1 of 12 7.3* 6.4 – 8.1


NTU over background

03/04 04/05

3.5 4.0

1.5 – 7.2 1.1 – 9.5

0 of 9 0 of 12 9.5 1.4 - 62

% exceeding 200 Fecal Coliform colonies /

100 ml

GMV: < 100 and < 10% not to exceed 200

03/04 04/05

22** 28**

0 - 160 0 – 450 0%

8%

29** 0 - 800

Total Phosphorus mg/L 03/04

04/050.025 0.028

0.018 - 0.0330.015 - 0.053 0.04 0.01 - 0.220

Nitrate + Nitrite-nitrogen mg/L 03/04

04/050.434 0.542

0.225 - 0.6540.276 - 0.87 0.526 0.078 - 1.25


Skookumchuck R

iver #0761_______________________________________________________________________________

159

Date Time TempC

pH DO mg/L

Cond @25c umhos/cm

FC cfu/100mL

Turb NTU

TP mg/L

NOx mg/L

COMMENTSFlow cfs

Skookumchuck @ USGS Gage near Hwy 507Thurston County Water Resources Monitoring Report 2003 - 2004

12/17/2003 9:45:00 AM 6.69 7.4 12.29 57 20 0.033 USGS flow data.7.2 736.0 0.582

1/20/2004 10:15:00 AM 6.48 7.2 12.68 58 15 0.027 USGS flow data.4.0 421.0 0.654

2/18/2004 1:45:00 PM 6.75 7.2 12.35 55 10 0.033 USGS flow data.5.5 437.0 0.645

3/16/2004 1:00:00 PM 7.68 7.4 13.31 58 0 0.018 FC <5. USGS flow data.3.0 255.0 0.472

4/20/2004 10:00:00 AM 10.13 7.4 11.32 62 45 0.021 USGS flow data.1.8 161.0 0.362

5/18/2004 12:30:00 PM 14.04 7.6 10.83 64 28 0.019 USGS flow data.1.5 105.0 0.329

7/14/2004 9:30:00 AM 16.65 6.9 9.10 67 65 0.018 USGS flow data.1.6 82.0 0.225

8/25/2004 10:45:00 AM 14.08 7.4 10.02 64 160 0.024 USGS flow data.2.6 126.0 0.278

9/21/2004 2:15:00 PM 13.21 7.7 11.15 69 25 0.028 USGS flow data.4.2 157.0 0.357

Skookumchuck R

iver #0761_______________________________________________________________________________

160

Date Time TempC

pH DO mg/L

Cond @25c umhos/cm

FC cfu/100mL

Turb NTU

TP mg/L

NOx mg/L

COMMENTSFlow cfs

Skookumchuck @ USGS Gage near Hwy 507Thurston County Water Resources Monitoring Report 2004 - 2005

10/20/2004 11:00:00 AM 12.25 6.4 9.99 68 450 0.045 USGS flow data.6.3 221.0 0.475

11/10/2004 9:45:00 AM 9.79 6.5 11.37 68 0 0.027 F.C. result is <5. USGS flow data.2.1 189.0 0.340

12/15/2004 12:45:00 PM 8.24 6.5 12.02 67 15 0.041 USGS flow data.9.5 378.0 0.870

1/13/2005 12:45:00 PM 5.10 6.8 11.85 68 85 0.031 USGS flow data.3.2 187.0 0.559

2/13/2005 12:10:00 PM 4.84 7.2 13.00 70 0 0.026 F.C. result is <5. USGS flow data.4.5 215.0 0.676

3/16/2005 11:30:00 AM 8.28 7.3 11.45 73 5 0.017 USGS flow data.2.6 74.0 0.550

4/13/2005 9:50:00 AM 7.66 7.2 11.76 59 120 0.031 USGS flow data.6.1 494.0 0.734

5/11/2005 10:30:00 AM 11.43 7.2 10.92 66 55 0.053 USGS flow data.8.0 407.0 0.638

6/8/2005 10:15:00 AM 12.39 7.3 10.26 72 45 0.020 USGS flow data.1.7 114.0 0.490

7/13/2005 9:40:00 AM 13.74 7.2 9.99 71 35 0.019 USGS flow data.1.3 102.0 0.455


1.1 82.0 0.440


1.9 121.0 0.276

Skookumchuck R

iver #0761_______________________________________________________________________________

161

wria 23 chapter includes: chehalis river prairie creek ...€¦ · date time temp c ph do mg/l cond...

Documents