General

• Region (Map) : ................. Upper Colorado
• State (Map) ...................... Colorado
• County .............................. Mesa
• Project: .............................. Collbran
• Dam type: ......................... Earthfill
• Location: .......................... 12 mi S of Collbran
• Watercourse: ................... Tributary of Big Creek
• Reservoir: ......................... Forty Acre Lake
• Construction Date: ..........1893
• National ID Number ........ CO82910
• Hydrologic Unit Code ....

Dimensions

• Crest Elevation of Dam: .................... 10249.3 ft
• Structural Height of Dam: ....................    14.0 ft
• Crest Length: .........................................  420.0 ft
• Top of Joint Use: .................................          NA
• Top of Active Conservation: ........... 10244.3 ft
• Top of Inactive Conservation: ..................  NA
• Spillway Crest: .................................... 10244.3 ft
• Top of Dead Storage: .........................10235.0 ft
• Streambed at Dam Axis : .............................  NA

Hydraulics

• Normal Water Surface Elev: .......... 10244.3 ft
• Hydraulic Height: ................................  10.0 ft
• Service Spillway Type:
•    Uncontrolled  Crest    .............................Yes
•    Morning-Glory ......................................... No
•    Crest Length    ...........................................  ft
•    Gated      .................................................... No
•    Capacity at Elev: ..................................... NA
• Auxiliary Spillway ....................................... No
•     Capacity at Elev.   .................................. NA
• Outlet Works Capacity at
•     Elevation      ft.,  ..................................... NA

Hydrology

• Drainage Area: .................................    0.4 sq mi
• Hydrometeorological Report         HMR  (NA)
• Flood Type: .................................................. NA
• Storm Duration: ............................................ NA
• Probable Maximum Flood (PMF) Report:
•   Peak Inflow: ............................................ 30 cfs
•   Inflow Volume: ................................  56 acre-ft
•   Flow Duration: ....................................... 96 hrs
•   PMF Routing MWS Elev.: ........................ NA
•   Initial Routing Elev: ......................... 10244.3 ft
•   Study Date: ............................ September 1969