General

• Region (Map) : .................. Pacific Northwest
• State (Map) ........................ Montana
• County ................................ Ravalli
• Project: ................................ Bitter Root
• Dam type: ........................... Earthfill
• Location: ............................ 15 mi S of Hamilton
• Watercourse: ..................... Rock Creek
• Reservoir: ........................... Lake Como
• Construction Date: ........... 1908-1910
• National ID Number .......... MT00564
• Hydrologic Unit Code ......

Dimensions

• Crest Elevation of Dam: .....................4249.00 ft
• Structural Height of Dam: ..................    70.00 ft
• Crest Length: .......................................2550.00 ft
• Top of Joint Use: ..................................         NA
• Top of Active Conservation: ........... 4242.70 ft
• Top of Inactive Conservation: ......... 4188.50 ft
• Spillway Crest: ...................................  4236.85 ft
• Top of Dead Storage: ........................ 4185.75 ft
• Streambed at Dam Axis : ................... 4184.00 ft

Hydraulics

• Normal Water Surface Elev.: ...............4242.7 ft
• Hydraulic Height: .................................... 62.5 ft
• Service Spillway Type:
•    Uncontrolled  Crest    ................................Yes
•    Morning-Glory ........................................... No
•    Crest Length    .......................................... 75 ft
•    Gated      ....................................................... No
•    Capacity at Elev.:  0.0  ft,                         0  cfs
• Auxiliary Spillway ......................................... No
•     Capacity at Elev.   ................................... 0 cfs
• Outlet Works Capacity at
•     Elevation  0.0 ft.,  .................................... 0 cfs 

Hydrology

• Drainage Area: .................................  56.4 sq mi
• Hydrometeorological Report               HMR 57
• Flood Type: .................................. June General
• Storm Duration: ........................................ 72 hrs
• Probable Maximum Flood (PMF) Report:
•   Peak Inflow: ...................................... 33,400 cfs
•   Inflow Volume: ........................... 53,100 acre-ft
•   Flow Duration: ....................................... 7 days
•   PMF Routing MWS Elev.: ....................... N/A
•   Initial Routing Elev.: .......................... 4242.7 ft
•   Study Date: ...................................... May 1994