General

• Region (Map) : ...................Great Plains
• State (Map) ........................ Texas
• County ................................ Live Oak
• Project: ................................ Nueces River
• Dam type: ........................... Earthfill
• Location: .................... 4 miles W of Three Rivers
• Watercourse: ..................... Frio River
• Reservoir: ............................Choke Canyon
• Construction Date: ............1981-1982
• National ID Number .......... TX04425
• Hydrologic Unit Code ......

Dimensions

• Crest Elevation of Dam: ......................241.14 ft
• Structural Height of Dam: ...................141.96 ft
• Crest Length: ........................................18,471 ft
• Top of Joint Use: ...................................       NA
• Top of Active Conservation: .............220.50 ft
• Top of Inactive Conservation: ...........150.50 ft
• Spillway Crest: ......................................182.43 ft
• Top of Dead Storage: ..........................136.38 ft
• Streambed at Dam Axis : .....................127.00 ft

Hydraulics

• Normal Water Surface Elev: ................. 220.5 ft
• Hydraulic Height: ................................ 132.38 ft
• Service Spillway Type:
•    Uncontrolled  Crest    ................................ No
•    Morning-Glory ........................................... No
•    Crest Length    .................................... 168.0 ft
•    Gated      ......................................................Yes
•    Capacity at Elev:  232.2 ft,            257,444 cfs
• Auxiliary Spillway ......................................... No
•     Capacity at Elev.   .................................. 0 cfs
• Outlet Works Capacity at
•     Elevation  212.31 ft.,  ........................541.6 cfs 

Hydrology

• Drainage Area: ...............................15,427 sq mi
• Hydrometeorological Report        HMR 51&52
• Flood Type: ..............................Summer General
• Storm Duration: ........................................ 72 hrs
• Probable Maximum Flood (PMF) Report:
•   Peak Inflow: ................................... 323,000 cfs
•   Inflow Volume: ..................... 2,772,000 acre-ft
•   Flow Duration: .................................... 15 days
•   PMF Routing MWS Elev.: ................. 233.0 ft
•   Initial Routing Elev: ............................ 220.5 ft
•   Study Date: ................................ January 1988