Little Grassy Dam (Little Grassy Lake)

Field Descriptions

Dam Name: Little Grassy Dam
NID ID: IL00084
Longitude: -89.1367
Latitude: 37.6467
Map Section: S18,T10S,R1E
County: WILLIAMSON
River: LITTLE GRASSY CREEK
State: IL
Owner Name: US FISH AND WILDLIFE SERVICE
Owner Type: Federal
Dam Designer: US FISH & WILDLIFE SERVICE
Private Dam? No
Dam Type: Earth
Core: Homogeneous Dam (Position)
Earth (Type)
Known (Certainty)
Foundation: RSK
Purposes: Fish and Wildlife Pond
Year Completed: 1942
Year Modified/Mod Type: 1992HSE, 2003F
Dam Length: 3650 feet
Dam Height: 88 feet
Structural Height: 88 feet
Hydraulic Height: 87.4 feet
Maximum Discharge: 35943 cu ft/sec
Maximum Storage: 30900 acre-feet
Normal Storage: 24000 acre-feet
Surface Area: 960 acres
Drainage Area: 15.6 square miles
Hazard Potential:
Emergency Action Plan? Yes
Inspection Date: 2011-06-20
Inspection Frequency: 3
State Regulated Dam? Yes
State Regulating Agency: IDNR
Spillway Type: Uncontrolled
Spillway Width: 598 feet
Outlet Gates: O;V
Federal Design Agency: Department of Interior;
Fish and Wildlife Service
Federal Construction Agency: Department of Interior;
Fish and Wildlife Service
Federal Regulatory Agency: Department of Interior;
Fish and Wildlife Service
Federal Inspection Agency: Department of Interior;
Fish and Wildlife Service
Federal Operating Agency: Department of Interior;
Fish and Wildlife Service
Federal Owner (Agency): Department of Interior;
Fish and Wildlife Service
Other Federal Agencies: Department of Interior;
Fish and Wildlife Service
Source Agency: Department of Interior;
Fish and Wildlife Service

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