General

• Region (Map)  ................... Upper Colorado
• State (Map) ........................ Colorado
• County ................................ Mesa
• Project: ................................ Collbran
• Dam type: ........................... Earthfill
• Location: ............................ 12 mi S. of Collbran
• Watercourse: ..................... Big Creek
• Reservoir: ........................... Bonham
• Construction Date: ............1962
• National ID Number .......... CO82904
• Hydrologic Unit Code .....

Dimensions

• Crest Elevation of Dam: ...................... 9800.7 ft
• Structural Height of Dam: ...................     40.0 ft
• Crest Length: ........................................   500.0 ft
• Top of Joint Use: .................................          NA
• Top of Active Conservation: ............. 9796.0 ft
• Top of Inactive Conservation: ........... 9774.3 ft
• Spillway Crest: ...................................... 9796.0 ft
• Top of Dead Storage: .......................... 9764.1 ft
• Streambed at Dam Axis : ..................... 9763.0 ft

Hydraulics

• Normal Water Surface Elev: .............. 9796.0 ft
• Hydraulic Height: ..............................      34.7 ft
• Service Spillway Type:
•    Uncontrolled  Crest   ................................Yes
•    Morning-Glory .........................................  No
•    Crest Length    .......................................... NA
•    Gated      ....................................................  No
•    Capacity at Elev: 9797.7 ft,              1,830 cfs
• Auxiliary Spillway ....................................... No
•     Capacity at Elev.   ................................. 0 cfs
• Outlet Works Capacity at
•     Elevation  9797.7 ft.,  .......................... 50 cfs

Hydrology

• Drainage Area: .....................................  4.34 sq mi
• Hydrometeorological Report (HMR)        HMR
• Flood Type: ..................................... June General
• Storm Duration: ........................................... 72 hrs
• Probable Maximum Flood (PMF) Report:
•   Peak Inflow: .......................................... 1,840 cfs
•   Inflow Volume: ..............................  8,495 acre-ft
•   Flow Duration: ....................................... 15 days
•   PMF Routing MWS Elev.: .......................... NA
•   Initial Routing Elev: ............................. 9796.0 ft
•   Study Date: ..................................... March 1952