General

• Region (Map) : ............. Pacific Northwest
• State (Map) ................... Washington
• County ........................... Okanogan
• Project: ........................... Okanogan
• Dam type: ...................... Zoned Earthfill
• Location: ....................... 17mi NW of Okanogan
• Watercourse: ................ Offstream storage
• Reservoir: ...................... Conconully Lake
• Construction Date: .......1919-1921
• National ID Number ..... WA00291
• Hydrologic Unit Code ...

Dimensions

• Crest Elevation of Dam: .................... 2330.25 ft
• Structural Height of Dam: ..................... 54.25 ft
• Crest Length: ...................................... 1250.00 ft
• Top of Joint Use: .......................................... NA
• Top of Active Conservation: ........... 2325.25 ft
• Top of Inactive Conservation: ....................NA
• Spillway Crest: .................................... 2325.25 ft
• Top of Dead Storage: ........................ 2282.10 ft
• Streambed at Dam Axis : ................... 2276.00 ft

Hydraulics

• Normal Water Surface Elev: ..............2325.25 ft
• Hydraulic Height: .................................. 40.00 ft
• Service Spillway Type:
•    Uncontrolled  Crest    ................................Yes
•    Morning-Glory ...........................................Yes
•    Crest Length    ..........................................  NA
•    Gated      ....................................................... No
•    Capacity at Elev:  2325.0  ft,            25,000 cfs
• Auxiliary Spillway .......................................... No
•     Capacity at Elev.   ................................... 0 cfs
• Outlet Works Capacity at
•     Elevation  2324.0 ft.,  .......................... 500 cfs

Hydrology

• Drainage Area: ...................................... 6.4 sq mi
• Hydrometeorological Report (HMR):   HMR 57
• Flood Type: .......................... December General
• Storm Duration: ......................................... 72 hrs
• Probable Maximum Flood (PMF) Report:
•   Peak Inflow: ......................................... 5,235 cfs
•   Inflow Volume: .............................. 4,235 acre-ft
•   Flow Duration: ........................................ 3 days
•   PMF Routing MWS Elev.: .......................... NA
•   Initial Routing Elev: .......................... 2324.25 ft
•   Study Date: .................................. August 1994