Brantley Dam


Brantley Dam is on the Pecos River at mile 478.5, about 13 miles upstream from the city of Carlsbad, New Mexico. It is about 10 miles upstream from the Avalon Dam in the Carlsbad Project and 25 miles downstream from Artesia.

The Brantley Project area extends about 16.5 miles above the damsite. The Pecos River watershed is in a semi-arid region. Average annual precipitation in the Pecos River Basin varies from about 10 inches near Pecos, Texas, to greater than 33 inches in th

The project's main purpose is to replace McMillan Dam, which was declared unsafe. Additional benefits include irrigation, flood control, fish and wildlife enhancement, and recreation.

RegionFacilities in Upper Colorado | Upper Colorado Home Page
StateNew Mexico
Dam Type
WatercoursePecos River
Original Construction1984 - 1989
Modified Construction
National ID NumberNM82901
Hydrologic Unit Code

Structural Height158.5 ft
Hydraulic Height (Normal Operating Depth at Dam)101.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation
Crest Elevation3308.5 ft
Crest Length20,850 ft
Crest Width
Base Width
Volume of Dam Construction Materials9,257,500 cu. yards
Streambed at Dam Axis3202.5 ft
Top of Exclusive Flood Control Pool (Elevation) 0
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)3255.3 ft
Top of Inactive Conservation Pool (Elevation)3224.5 ft
Top of Dead Storage Pool (Elevation)3210.7 ft

Hydraulics & Hydrology
Total Water Storage at Elevation
Maximum Water Surface Elevation3303.5 ft
Normal Water Surface Elevation
Spillway Type
Auxiliary Spillway
Spillway Capacity at Elevation
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation
Diversion Capacity at Elevation
Drainage Area17600 sq mi
Hydrometeorological Report (HMR)
Probable Maximum Flood (PMF) Report

Contact Information
TitleArea Office Manager
OrganizationAlbuquerque Area Office
Address555 Broadway NE, Suite 100
CityAlbuquerque, NM 87102-2352
Phone (Office)505 462-3542
OrganizationCarlsbad Irrigation District
Address201 South Canal St
CityCarlsbad, NM 88220
Phone (Office)505 885-3203

Last updated: Feb 19, 2009