General

• Region (Map) : .......... Great Plains
• State (Map) ..............  Colorado
• County ....................... Larimer
• Project: ....................... Colorado Big Thompson
• Dam type: .................. Earthfill
• Location: .................... 3 mi SE of Fort Collins
• Watercourse: ............ Offstream storage
• Reservoir: .................. Horsetooth
• Construction Date:....1946-1949
• National ID Number ... CO01667
• Hydrologic Unit Code ...

Dimensions

• Crest Elevation of Dam: ..................... 5443.0 ft¹
• Structural Height of Dam: .................... 226.0 ft
• Crest Length: ....................................... 1438.0 ft
• Top of Joint Use: ..................................        NA
• Top of Active Conservation: ............ 5430.0 ft
• Top of Inactive Conservation: ...........5325.0 ft
• Spillway Crest: ......................................        NA
• Top of Dead Storage: ......................... 5270.0 ft
• Streambed at Dam Axis : ......................        NA

        ¹ 1988 modification raised the dam crest to elev. 5443.0 feet

Hydraulics

• Normal Water Surface Elev: ................5430.0 ft
• Hydraulic Height: .................................. 203.0 ft
• Service Spillway Type:
•    Uncontrolled  Crest    .................................No
•    Morning-Glory ........................................... No
•    Crest Length    ........................................... NA
•    Gated      ....................................................... No
•    Capacity at Elev:  0  ft,                              0 cfs
• Auxiliary Spillway ......................................... No
•     Capacity at Elev.   ................................... 0 cfs
• Outlet Works Capacity at
•     Elevation  5430.0 ft.,  ............................ 90 cfs

Hydrology

• Drainage Area: .................................. 17.0 sq mi
• Hydrometeorological Report               HMR 55

Flood Type: ...............................Winter General

• Storm Duration: ........................................ 72 hrs
• Probable Maximum Flood (PMF) Report:
•   Peak Inflow: ..................................... 96,800 cfs
•   Inflow Volume: ..........................  21,520 acre-ft
•   Flow Duration: ........................................ 14 hrs
•   PMF Routing MWS Elev.: ........................ NA
•   Initial Routing Elev: ........................... 5430.0 ft
•   Study Date: ............................. December 1982