volume 2 of 2 madison county, illinois
TRANSCRIPT
LV2004084 Madison County IL.pdf COMMUNITY NAME
EDWARDSVILLE, CITY OF 170441
GODFREY, VILLAGE OF 171031
GRANTFORK, VILLAGE OF 170209
HAMEL, VILLAGE OF 170160
HARTFORD, VILLAGE OF 170444
HIGHLAND, CITY OF 170445
LIVINGSTON, VILLAGE OF 170794
MADISON, CITY OF 170446
PIERRON, VILLAGE OF 170317
ROXANA, VILLAGE OF 170448
TROY, CITY OF 170255
VENICE, CITY OF 170450
WILLIAMSON, VILLAGE OF 170324
WORDEN, VILLAGE OF 170825
Federal Emergency Management Agency
FLOOD INSURANCE STUDY NUMBER
Communities participating in the National Flood Insurance Program (NFIP) have established
repositories of flood hazard data for floodplain management and flood insurance purposes. This
Flood Insurance Study (FIS) report may not contain all data available within the Community Map
Repository. It is advisable to contact the Community Map Repository for any additional data.
The Federal Emergency Management Agency (FEMA) may revise and republish part or all of
this FIS at any time. In addition, FEMA may revise part of this FIS report by the Letter of Map
Revision (LOMR) process, which does not involve republication or redistribution of the FIS
report. Therefore, users should consult with community officials and check the Community Map
Repository to obtain the most current FIS report components.
Selected Flood Insurance Rate Map panels for this community contain information that was
previously shown separately on the corresponding Flood Boundary and Floodway Map panels
(e.g., floodways, cross sections). In addition, former flood hazard zone designations have been
changed as follows:
Initial Countywide FIS Effective Date:
This preliminary FIS report does not include unrevised Floodway Data tables or unrevised Flood
Profiles. These Floodway Data tables and Flood Profiles will appear in the final FIS report.
i
Page
1.3 Coordination 4
2.2 Community Description 9
3.0 ENGINEERING METHODS 16
3.1 Hydrologic Analyses 17
3.2 Hydraulic Analyses 23
3.3 Vertical Datum 26
4.1 Floodplain Boundaries 29
6.0 FLOOD INSURANCE RATE MAP 76
7.0 OTHER STUDIES 76
FIGURES
ii
Page
TABLES
TABLE 2 – Limits of Previously Detailed Studies 5
TABLE 3 – Limits of New Detailed Studies 7
TABLE 4 – Letters of Map Change 9
TABLE 5 – Peak Discharge Values 19
TABLE 6 – Manning’s “n” Values 24
TABLE 7 – Summary of Still Water Elevations 25
TABLE 8 – Datum Conversion Calculations by Stream 26
TABLE 9 – Mississippi River Vertical Datum Conversions 27
TABLE 10– Floodway Data Tables 34-74
TABLE 11– Community Map History 77-78
Table of Contents – Volume 2
EXHIBITS
Cahokia Creek 02P – 09P
Canteen Creek 10P – 12P
East Alton Ditch 15P
Honeycut Branch 21P
Judys Branch Tributary 5B 35P – 36P
Judys Branch Tributary 9 37P
Judys Branch Tributary 9A 38P
Judys Branch Tributary 9B 39P
Judys Branch Tributary 10 40P
Judys Creek 41P – 43P
Laurel Branch 45P – 46P
Lindenthal Creek 48P – 50P
Mississippi River 55P – 57P
Mooney Creek 58P – 61P
iii
EXHIBITS (continued)
Mooney Creek Tributary 2 Panels 63P
Paddock Creek 64P – 66P
Silver Creek 68P – 69P
Silver Creek Tributary No. 2 71P – 72P
Smith Lake Tributary 73P
Stanley Creek 75P
Sugar Fork 76P
Tributary E 77P
Tributary F 78P
Tributary G 79P
Tributary X 80P
Tributary Z 81P
Wood River 85P
Flood Insurance Rate Maps
450
460
470
410
420
430
440
450
460
470
480 480
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE MOUTH
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
L IM IT O F D E T A IL E D S T U D Y
U S B U S IN E S S R O U T E 4 0
S T A T E R O U T E 1 5 7
R A IL R O A D
L A K E S ID E D R IV E
C O R P O R A T E L IM IT S
C O R P O R A T E L IM IT S
C O R P O R A T E L IM IT S
F A R M R O A D
10%, 2%, 1% AND 0.2%
COINCIDE IN THIS REGION
500
510
520
460
470
480
490
500
510
520
530 530
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE MOUTH 11P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
C L IN T O N S T R E E T
M IL L S T R E E T
M U L B E R R Y R O A D
M A D IS O N C O U N T Y
S T . C L A IR C O U N T Y B O U N D A R Y
C IT Y O F C O L L IN S V IL L E
M A D IS O N C O U N T Y
C O U N T Y R O A D
R O L E K R O A D
R A IL R O A D
L E B A N O N R O A D
C IT Y O F C O L L IN S V IL L E
C O R P O R A T E L IM IT S
C IT Y O F C O L L IN S V IL L E
C O R P O R A T E L IM IT S
470
480
490
500
510
520
490
500
510
520
530 530
68,000 70,000 72,000 74,000 76,000 78,000
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE MOUTH 12P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
L IM IT O F D E T A IL E D S T U D Y
T R O Y R O A D
IN T E R S T A T E 5 5
T R O Y R O A D
440
0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10
S E M IN A R Y S T R E E T
1.20
450
460
470
480
430
420
490
500
510
440
450
460
470
480
490
500
510
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN MILES ABOVE MOUTH 13P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
C IT Y O F A L T O N
C O R P O R A T E L IM IT S
N O R T H R O D G E R S A V E N U E
N O R T H R O D G E R S R O A D
460
470
1.40
480
490
500
450
440
510
520
530
460
470
480
490
500
510
520
530
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN MILES ABOVE MOUTH 14P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
FLOODS COINCIDE IN THIS REGION
C O N F L U E N C E O F B L A C K C R E E K
L IM IT O F D E T A IL E D S T U D Y
0 500 1000 1500 2000 2500 3000 3500 4000
430
435
440
445
450
455
460
465
M A IN S T R E E T
W A S H IN G T O N A V E N U E
W O O D R IV E R A V E N U E
6 T H S T R E E T
5 T H S T R E E T
D O U G L A S S T R E E T
L IM IT O F D E T A IL E D S T U D Y
S O U T H F L A N K
W O O D R IV E R L E V E E
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE SOUTH FLANK WOOD RIVER LEVEE 15P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
430
420
410
400
28,000
460
470
480
490
440
450
430
420
460
470
480
490
30,000 32,000 34,000
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MISSISSIPPI RIVER 18P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
C O R P O R A T E L IM IT S
P O W D E R M IL L R O A D
R A IL R O A D
M A G A Z IN E R O A D
V IL L A G E O F E A S T A L T O N
C O N F L U E N C E O F
W E S T F O R K W O O D R IV E R
L IM IT O F F L O O D IN G
A F F E C T IN G V IL L A G E O F E A S T A L T O N
C O R P O R A T E L IM IT S
5500
410
400
420
430
440
450
460
470
480
490
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL 28P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
5000 6000 6500 7000 7500 8000 8500 9000 9500 10,000 10,500 11,000 11,500
12,000
420
410
430
440
450
460
470
480
490
500
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL 29P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
11,500 12,500 13,000 13,500 14,000 14,500 15,000 15,500 16,000 16,500 17,000 17,500 18,000
30P
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL
24,50018,500
450
440
460
470
480
490
500
510
520
530
CROSS SECTION LOCATION
18000 19,000 19,500 20,000 20,500 21,000 21,500 22,000 22,500 23,000 23,500 24,000
25,000
470
460
480
490
500
510
520
530
540
550
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL 31P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
24,500 25,500 26,000 26,500 27,000 27,500 28,000 28,500 29,000 29,500 30,000 30,500 31,000
7000
530
520
540
550
560
570
580
590
600
610
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH TRIBUTARY 5 36P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
6500 7500 8000
L IM IT O F D E T A IL E D S T U D Y
540
550
560
570
580
590
600
610
515
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDY'S BRANCH 37P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
500
475
470
480
485
490
495
500
505
510
L IM IT O F D E T A IL E D S T U D Y
E . IN G L E D R IV E
0 1000 1500 2000 2500
CULVERT
38P
500
490
485
495
500
505
510
515
520
525
530
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH TRIBUTARY 9
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
0 1000 1500 2000 2500 3000
A U T U M N G L E N D R IV E
P U B L IC W O R K S E N T R A N C E
A S H R O A D
L IM IT O F D E T A IL E D S T U D Y
CULVERT
CULVERT
CULVERT
39P
500
485
480
490
495
500
505
510
515
520
525
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH TRIBUTARY 9
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
500
485
480
490
495
500
505
510
515
520
E L E V A T IO N I N F E E T ( N A V D 8 8 )
0 1000 1500
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH 41P
500
430
420
440
450
460
470
480
490
500
510
E L E V A T IO N I N F E E T ( N A V D 8 8 )
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
0 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH 42P
7000
450
440
460
470
480
490
500
510
520
530
CROSS SECTION LOCATION
6500 7500 8000 8500 9000 9500 10,000 10,500 11,000 11,500 12,000 12,500 13,000
560
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH 43P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
500
485
480
490
495
500
505
510
515
520
525
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS CREEK 44P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
420
430
440
450
410
400
390
380
0
460
470
420
430
440
450
410
400
460
470
16,000 18,000 20,000 22,000
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MISSISSIPPI RIVER 85P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE BACKWATER FROM MISSISSIPPI RIVER
C O N F L U E N C E W IT H
M IS S IS S IP P I R IV E R
R A IL R O A D
M IL T O N R O A D
E A S T B R O A D W A Y R O A D
R A IL R O A D
S A IN T L O U IS A V E N U E
R A IL R O A D
R A IL R O A D
L E W IS A N D C L A R K
B O U L E V A R D
V IL L A G E O F E A S T A L T O N
C O R P O R A T E L IM IT S
V IL L A G E O F E A S T A L T O N
C O R P O R A T E L IM IT S
V IL L A G E O F E A S T A L T O N
C O R P O R A T E L IM IT S
WOOD RIVER
21P Honeycut Branch
22P Indian Creek
25P Joulters Creek
28P Judys Branch
41P Judys Creek
45P Laurel Branch
55P Mississippi River
58P Mooney Creek
64P Paddock Creek
68P Silver Creek
73P Smith Lake Tributary
75P Stanley Creek
76P Sugar Fork
77P Tributary E
78P Tributary F
79P Tributary G
80P Tributary X
81P Tributary Z
85P Wood River
EDWARDSVILLE, CITY OF 170441
GODFREY, VILLAGE OF 171031
GRANTFORK, VILLAGE OF 170209
HAMEL, VILLAGE OF 170160
HARTFORD, VILLAGE OF 170444
HIGHLAND, CITY OF 170445
LIVINGSTON, VILLAGE OF 170794
MADISON, CITY OF 170446
PIERRON, VILLAGE OF 170317
ROXANA, VILLAGE OF 170448
TROY, CITY OF 170255
VENICE, CITY OF 170450
WILLIAMSON, VILLAGE OF 170324
WORDEN, VILLAGE OF 170825
Federal Emergency Management Agency
FLOOD INSURANCE STUDY NUMBER
Communities participating in the National Flood Insurance Program (NFIP) have established
repositories of flood hazard data for floodplain management and flood insurance purposes. This
Flood Insurance Study (FIS) report may not contain all data available within the Community Map
Repository. It is advisable to contact the Community Map Repository for any additional data.
The Federal Emergency Management Agency (FEMA) may revise and republish part or all of
this FIS at any time. In addition, FEMA may revise part of this FIS report by the Letter of Map
Revision (LOMR) process, which does not involve republication or redistribution of the FIS
report. Therefore, users should consult with community officials and check the Community Map
Repository to obtain the most current FIS report components.
Selected Flood Insurance Rate Map panels for this community contain information that was
previously shown separately on the corresponding Flood Boundary and Floodway Map panels
(e.g., floodways, cross sections). In addition, former flood hazard zone designations have been
changed as follows:
Initial Countywide FIS Effective Date:
This preliminary FIS report does not include unrevised Floodway Data tables or unrevised Flood
Profiles. These Floodway Data tables and Flood Profiles will appear in the final FIS report.
i
Page
1.3 Coordination 4
2.2 Community Description 9
3.0 ENGINEERING METHODS 16
3.1 Hydrologic Analyses 17
3.2 Hydraulic Analyses 23
3.3 Vertical Datum 26
4.1 Floodplain Boundaries 29
6.0 FLOOD INSURANCE RATE MAP 76
7.0 OTHER STUDIES 76
FIGURES
ii
Page
TABLES
TABLE 2 – Limits of Previously Detailed Studies 5
TABLE 3 – Limits of New Detailed Studies 7
TABLE 4 – Letters of Map Change 9
TABLE 5 – Peak Discharge Values 19
TABLE 6 – Manning’s “n” Values 24
TABLE 7 – Summary of Still Water Elevations 25
TABLE 8 – Datum Conversion Calculations by Stream 26
TABLE 9 – Mississippi River Vertical Datum Conversions 27
TABLE 10– Floodway Data Tables 34-74
TABLE 11– Community Map History 77-78
Table of Contents – Volume 2
EXHIBITS
Cahokia Creek 02P – 09P
Canteen Creek 10P – 12P
East Alton Ditch 15P
Honeycut Branch 21P
Judys Branch Tributary 5B 35P – 36P
Judys Branch Tributary 9 37P
Judys Branch Tributary 9A 38P
Judys Branch Tributary 9B 39P
Judys Branch Tributary 10 40P
Judys Creek 41P – 43P
Laurel Branch 45P – 46P
Lindenthal Creek 48P – 50P
Mississippi River 55P – 57P
Mooney Creek 58P – 61P
iii
EXHIBITS (continued)
Mooney Creek Tributary 2 Panels 63P
Paddock Creek 64P – 66P
Silver Creek 68P – 69P
Silver Creek Tributary No. 2 71P – 72P
Smith Lake Tributary 73P
Stanley Creek 75P
Sugar Fork 76P
Tributary E 77P
Tributary F 78P
Tributary G 79P
Tributary X 80P
Tributary Z 81P
Wood River 85P
Flood Insurance Rate Maps
450
460
470
410
420
430
440
450
460
470
480 480
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE MOUTH
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
L IM IT O F D E T A IL E D S T U D Y
U S B U S IN E S S R O U T E 4 0
S T A T E R O U T E 1 5 7
R A IL R O A D
L A K E S ID E D R IV E
C O R P O R A T E L IM IT S
C O R P O R A T E L IM IT S
C O R P O R A T E L IM IT S
F A R M R O A D
10%, 2%, 1% AND 0.2%
COINCIDE IN THIS REGION
500
510
520
460
470
480
490
500
510
520
530 530
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE MOUTH 11P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
C L IN T O N S T R E E T
M IL L S T R E E T
M U L B E R R Y R O A D
M A D IS O N C O U N T Y
S T . C L A IR C O U N T Y B O U N D A R Y
C IT Y O F C O L L IN S V IL L E
M A D IS O N C O U N T Y
C O U N T Y R O A D
R O L E K R O A D
R A IL R O A D
L E B A N O N R O A D
C IT Y O F C O L L IN S V IL L E
C O R P O R A T E L IM IT S
C IT Y O F C O L L IN S V IL L E
C O R P O R A T E L IM IT S
470
480
490
500
510
520
490
500
510
520
530 530
68,000 70,000 72,000 74,000 76,000 78,000
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE MOUTH 12P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
L IM IT O F D E T A IL E D S T U D Y
T R O Y R O A D
IN T E R S T A T E 5 5
T R O Y R O A D
440
0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10
S E M IN A R Y S T R E E T
1.20
450
460
470
480
430
420
490
500
510
440
450
460
470
480
490
500
510
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN MILES ABOVE MOUTH 13P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
C IT Y O F A L T O N
C O R P O R A T E L IM IT S
N O R T H R O D G E R S A V E N U E
N O R T H R O D G E R S R O A D
460
470
1.40
480
490
500
450
440
510
520
530
460
470
480
490
500
510
520
530
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN MILES ABOVE MOUTH 14P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
FLOODS COINCIDE IN THIS REGION
C O N F L U E N C E O F B L A C K C R E E K
L IM IT O F D E T A IL E D S T U D Y
0 500 1000 1500 2000 2500 3000 3500 4000
430
435
440
445
450
455
460
465
M A IN S T R E E T
W A S H IN G T O N A V E N U E
W O O D R IV E R A V E N U E
6 T H S T R E E T
5 T H S T R E E T
D O U G L A S S T R E E T
L IM IT O F D E T A IL E D S T U D Y
S O U T H F L A N K
W O O D R IV E R L E V E E
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE SOUTH FLANK WOOD RIVER LEVEE 15P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
430
420
410
400
28,000
460
470
480
490
440
450
430
420
460
470
480
490
30,000 32,000 34,000
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MISSISSIPPI RIVER 18P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
C O R P O R A T E L IM IT S
P O W D E R M IL L R O A D
R A IL R O A D
M A G A Z IN E R O A D
V IL L A G E O F E A S T A L T O N
C O N F L U E N C E O F
W E S T F O R K W O O D R IV E R
L IM IT O F F L O O D IN G
A F F E C T IN G V IL L A G E O F E A S T A L T O N
C O R P O R A T E L IM IT S
5500
410
400
420
430
440
450
460
470
480
490
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL 28P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
5000 6000 6500 7000 7500 8000 8500 9000 9500 10,000 10,500 11,000 11,500
12,000
420
410
430
440
450
460
470
480
490
500
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL 29P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
11,500 12,500 13,000 13,500 14,000 14,500 15,000 15,500 16,000 16,500 17,000 17,500 18,000
30P
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL
24,50018,500
450
440
460
470
480
490
500
510
520
530
CROSS SECTION LOCATION
18000 19,000 19,500 20,000 20,500 21,000 21,500 22,000 22,500 23,000 23,500 24,000
25,000
470
460
480
490
500
510
520
530
540
550
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL 31P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
24,500 25,500 26,000 26,500 27,000 27,500 28,000 28,500 29,000 29,500 30,000 30,500 31,000
7000
530
520
540
550
560
570
580
590
600
610
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH TRIBUTARY 5 36P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
6500 7500 8000
L IM IT O F D E T A IL E D S T U D Y
540
550
560
570
580
590
600
610
515
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDY'S BRANCH 37P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
500
475
470
480
485
490
495
500
505
510
L IM IT O F D E T A IL E D S T U D Y
E . IN G L E D R IV E
0 1000 1500 2000 2500
CULVERT
38P
500
490
485
495
500
505
510
515
520
525
530
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH TRIBUTARY 9
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
0 1000 1500 2000 2500 3000
A U T U M N G L E N D R IV E
P U B L IC W O R K S E N T R A N C E
A S H R O A D
L IM IT O F D E T A IL E D S T U D Y
CULVERT
CULVERT
CULVERT
39P
500
485
480
490
495
500
505
510
515
520
525
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH TRIBUTARY 9
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
500
485
480
490
495
500
505
510
515
520
E L E V A T IO N I N F E E T ( N A V D 8 8 )
0 1000 1500
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH 41P
500
430
420
440
450
460
470
480
490
500
510
E L E V A T IO N I N F E E T ( N A V D 8 8 )
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
CROSS SECTION LOCATION
0 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH 42P
7000
450
440
460
470
480
490
500
510
520
530
CROSS SECTION LOCATION
6500 7500 8000 8500 9000 9500 10,000 10,500 11,000 11,500 12,000 12,500 13,000
560
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH 43P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
500
485
480
490
495
500
505
510
515
520
525
E L E V A T IO N I N F E E T ( N A V D 8 8 )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS CREEK 44P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
420
430
440
450
410
400
390
380
0
460
470
420
430
440
450
410
400
460
470
16,000 18,000 20,000 22,000
E L E V A T IO N I N F E E T ( N A V D )
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MISSISSIPPI RIVER 85P
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
2% ANNUAL CHANCE FLOOD
10% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE BACKWATER FROM MISSISSIPPI RIVER
C O N F L U E N C E W IT H
M IS S IS S IP P I R IV E R
R A IL R O A D
M IL T O N R O A D
E A S T B R O A D W A Y R O A D
R A IL R O A D
S A IN T L O U IS A V E N U E
R A IL R O A D
R A IL R O A D
L E W IS A N D C L A R K
B O U L E V A R D
V IL L A G E O F E A S T A L T O N
C O R P O R A T E L IM IT S
V IL L A G E O F E A S T A L T O N
C O R P O R A T E L IM IT S
V IL L A G E O F E A S T A L T O N
C O R P O R A T E L IM IT S
WOOD RIVER
21P Honeycut Branch
22P Indian Creek
25P Joulters Creek
28P Judys Branch
41P Judys Creek
45P Laurel Branch
55P Mississippi River
58P Mooney Creek
64P Paddock Creek
68P Silver Creek
73P Smith Lake Tributary
75P Stanley Creek
76P Sugar Fork
77P Tributary E
78P Tributary F
79P Tributary G
80P Tributary X
81P Tributary Z
85P Wood River