Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

* We've detected you're using a mobile device. Find our Next Generation Station Page here.
Click to hideNews Bulletins

Water-Year Summary for Site 08403800

Click to hide Water-Year Summary instructions and information
  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00054 Reservoir storage(Obs.)  

Water year 2022: 2021-10-01 to 2022-09-30

Print this page
USGS Water-Year Summary 2022
LOCATION - Lat 32°29'28.92", long 104°15'08.45" referenced to North American Datum of 1983, Eddy County, NM, Hydrologic Unit 13060011, on headwall at outlet gate of dam on Pecos River, 3.3 mi north of Carlsbad, and at mile 467.2. 
DRAINAGE AREA - 18,070 mi². (approximate contributing area)
PERIOD OF RECORD - January 1939 to September 1965 (monthend gage heights and storage), October 1965 to March 2017 (daily observations of storage), October 2017 to current year (gage height). Monthend gage heights January 1919 to December 1938 in files of Pecos River Commission.
GAGE - Water-stage recorder with satellite telemetry. Elevation of gage is 3,157.0 ft above NGVD of 1929 (levels by Bureau of Reclamation).
COOPERATION - Storage records were provided by Carlsbad Irrigation District.
REMARKS - Lake is formed by Avalon Dam, an earthfill structure. The original Eddy (Avalon) Dam was completed and storage began in 1891. The dam was destroyed by the flood of Aug. 3, 1893; repaired immediately. The dam was destroyed again Oct. 2, 1904; construction of present dam commenced on June 1, 1906, and was 88 percent complete June 30, 1907. Capacity (based on Feb. 1996 survey) 4,470 acre-ft between gage heights 0.0 (sill of outlet gates) and 20.4 ft (crest of spillway 2). No dead storage. No storage allocated to flood control. New capacity table put into use Jan. 1, 1997. Water is used by Carlsbad Irrigation District.
EXTREMES OUTSIDE PERIOD OF RECORD - (SINCE 1938): Maximum contents, 11,000 acre-ft, May 22, 1941, gage height, 25.0 ft; no storage at times when natural flow is passing through reservoir.