TX82908 - Palmetto Bend Dam


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Palmetto Bend Dam


	Statistics

General

Region (Map) : ...................Great Plains
State (Map) .........................Texas

County ................................ Jackson

Project: ................................ Palmetto Bend
Dam type: ........................... Earthfill

Location: ............................. 7 mi SE of Edna

Watercourse: ..................... Navidad River

Reservoir: ........................... Palmetto Bend

Construction Date: ............1976-1980

National ID Number .......... TX82908

Hydrologic Unit Code ......

Dimensions

Crest Elevation of Dam: ........................ 55.0 ft
Structural Height of Dam: ...................... 93.0 ft
Crest Length: ..................................... 42,200.0 ft
Top of Joint Use: .......................................... NA
Top of Active Conservation: ................. 44.0 ft
Top of Inactive Conservation: ............... 15.0 ft
Spillway Crest: ............................................ x.0 ft
Top of Dead Storage: ................................ 8.0 ft
Streambed at Dam Axis : ........................... 0.0 ft

Hydraulics

Normal Water Surface Elev: ................... 44.0 ft
Hydraulic Height: .....................................53.0 ft
Service Spillway Type:

Uncontrolled Crest .................................No

Morning-Glory ........................................... No
Crest Length .................................... 434.0 ft
Gated ..................................................... Yes

Capacity at Elev: ....44.0 ft, 176,400 cfs

Auxiliary Spillway ......................................... No

Capacity at Elev. .................................. 0 cfs

Outlet Works Capacity at
Elevation ................................................ NA

Hydrology

Drainage Area: ................................. sq mi

Hydrometeorological Report HMR

Flood Type: ...............................General

Storm Duration: ....................................... hrs

Probable Maximum Flood (PMF) Report:

Peak Inflow: .................................. cfs

Inflow Volume: ........................ acre-ft

Flow Duration: ......................................0 days

PMF Routing MWS Elev.: ................. x.0 ft

Initial Routing Elev: ............................ x.0 ft

Study Date:

Power Generation

Power Generation at Dam Site - None

Bureau of Reclamation Power Program

Narration

Geology

Palmetto Bend Dam is built on Texas Coastal Plain within the Coastal Prairie Belt physiographic division. The Coastal Plain is underlain by sedimentary formations of Cenozoic and Mesozoic Age which have and estimated total thicknesss of at least 20,000 to 30,000 feet. Regional dip is southeastward at slight angle into the Gulf Coast Geosyncline. The Coastal Prairie Belt, the gulfward belt of the Coastal Plain, is a depositional land surface built up in relatively late geologic time by coalescing deltas of widely meandering, sediment-laden streams. This surface has been little modified by erosion. At Palmetto Bend Dam the relatively shallow valley of the Navidad River is surrounded by nearly flat praires which slope very gently toward the Gulf of Mexico. Deeply buried normal faults (generally parallel and downthrown to the coast) have been indicated by deep drilling in the general area but none are known to cutt the surface at the dam. The dam os located in an area considered to be the lowest seismic rick in the United States.

Links

| Recreation | NA

| Dams Located by State | USBR Texas Dams | South Great Plains Region Dams |

| Owner: Lavaca-Navidad River Authority,
PO Box 429, Edna, TX 77957, (512) 782-5229

| Operator: Lavaca-Navidad River Authority,
PO Box 429, Edna, TX 77957, (512) 782-5229