mt fwp presentation on bighorn river and … fwp presentation on bighorn river and lake management....
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MT FWP PRESENTATION ON BIGHORN RIVER AND LAKE MANAGEMENT
LONG-TERM WORKING GROUP
JANUARY 2008
BIGHORN RIVER FLOWS
0
2000
4000
6000
8000
10000
12000
14000
16000
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 0 1 2 3 4 5 6 7FL
OW
(cfs
)
BIGHORN FLOW RECOMENDATIONS
Target Minimum Flow – 2,500 cfs
Preferred Min. Fisheries Flow – 2,000 cfs
Absolute Min. Fisheries Flow - 1,500 cfs
BIGHORN DROUGHT FLOWS
0
200
400
600
800
1000
1200
1400
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 0 1 2 3 4 5 6 7
Con
tinuo
us D
ays
<2000 <1600 1300
1330 DAYS
338
Bighorn Lake ElevationMay 20-September 5
3560
3570
3580
3590
3600
3610
3620
3630
3640
3650
3660
0 10 20 30 40 50 60 70 80 90 100
% Time Exceeded
Elev
atio
n (fe
et)
Horseshoe Bend Safe Boat Launch
Ok-A-Beh & Barry’s Landing Safe Boat Launch
76%
99%
1967-2006
Lake Level Duration Curve During Recreation Season
1,900 cfs12/2007
1,500 cfs7/2007
1,900 cfs12/2007
1,500 cfs7/2007
1,900 cfs12/2007
1,500 cfs7/2007
1,900 cfs12/2007
1,500 cfs7/2007
1,900 cfs12/2007
1,500 cfs7/2007
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
BR
OW
N T
RO
UT
PER
MIL
E
86 87 88 89 90 91 92 93 94 95 96 97 98 99 0 1 2 3 4 5* 6* 7
BROWN TROUT - UPPER SECTION
AGE 1 AGE 2 AGE 3 AGE 4+ 2006 2007
10+
0
500
1000
1500
2000
2500
3000
NU
MB
ER P
ER M
ILE
86 87 88 89 90 91 92 93 94 95 96 97 98 99 0 1 2 3 4 5 6 7
BROWN TROUT - LOWER SECTION
AGE 1 AGE 2 AGE 3 AGE 4+ 2005 2006 2007
0
500
1000
1500
2000
2500
3000
NU
MB
ER P
ER M
ILE
86 87 88 89 90 91 92 93 94 95 96 97 98 99* 0* 1* 2 3 4 5* 6* 7*
RAINBOW - UPPER SECTION
AGE 1 AGE 2 AGE 3 AGE 4 AGE 5+ 2006 2007
13+11"+ 15"+
15"+
10"+ 12"+
0
500
1000
1500
2000
2500
NU
MB
ER P
ER M
ILE
86 87 88 89 90 91 92 93 94 95 96 97 98 99 0 1 2 3 4 5 6 7
RAINBOW - LOWER SECTION
AGE 1 AGE 2 AGE 3 AGE 4 AGE 5+ AGE 1 2005 2006 2007
FALL GILL NETTING
NUMBER PER NET
2000 2001 2002 2003 2004 2005 2006 2007
Lower Reservoir
WALLEYE 1.3 0.3 ___ 0.8 0.2 4.8 2.2 5.7
SAUGER ___ 2.0 ___ 0.2 ___ ___ 1.8 4.7 SMALLMOUTH
BASS 1.3 ___ ___ 0.2 0.3 4.0 2.0 3.5
CHANNEL CATFISH
1.8 0.2 ___ 0.2 0.8 0.6 1.2 0.2
BURBOT 0.2 ___ ___ ___ ___ 0.2 0.2 0.7 BROWN TROUT
1.2 0.3 ___ 1.3 0.5 0.3 0.8 0.7
Upper Reservoir
WALLEYE
14.0 ___ ___ 0.6 6.7 1.5 7.3
SAUGER 2.0 ___ ___ 0.6 0.5 17.2 14.5 SMALLMOUTH
BASS 1.0 ___ ___ 0.1 1.2 0.5 3.5
CHANNEL CATFISH
1.8 ___ ___ 0.8 7.8 2.2 5.7
BURBOT 0.2 ___ ___ ___ ___ 0.3 0.5 BROWN TR 0.5 ___ ___ 0.7 2.5 0.2 1.3
SPRING GILL NETTING
NUMBER PER NET
2000 2001 2002 2003 2004 2005 2006 2007
Lower Reservoir
WALLEYE 1.5 1.8 1.0 2.2 3.3 SAUGER 0.2 ___ ___ 0.3 2.3
SMALLMOUTH BASS
0.2 ___ 0.2 2.0 ___
CHANNEL CATFISH
0.5 ___ ___ 0.3 1.5
BURBOT 0.2 0.2 ___ ___ 1.2 BROWN TROUT
0.6 ___ 1.0 0.5 1.7
Upper Reservoir
WALLEYE 0.8 1.3 0.2 0.2 1.5 SAUGER ___ ___ ___ 6.2 17.0
SMALLMOUTH BASS
0.2 0.5 ___ ___ ___
CHANNEL CATFISH
0.5 ___ ___ 6.3 5.5
BURBOT ___ ___ 0.3 1.5 0.8 BROWN TR ___ ___ ___ 0.5 1.2
