USGS Water-Year Summary 2021
08403500 CARLSBAD MAIN CANAL AT HEAD, NEAR CARLSBAD, NM
LOCATION - Lat 32°29'25.42", long 104°15'09.82" referenced to North American Datum of 1983, Eddy County, NM, Hydrologic Unit 13060011, on right bank 220 ft downstream from headgates in Avalon Dam, and 3.3 mi north of Carlsbad, and at Pecos River mile 467.2.
PERIOD OF RECORD - July 1939 to current year (monthly discharge only, July 1939 to September 1965). January 1941 to March 1951 published in WSP 1732.
GAGE - Water-stage recorder with satellite telemetry, crest-stage gage and concrete control. Elevation of gage is 3,156.50 ft above NGVD of 1929 (levels by Bureau of Reclamation). Prior to Mar. 1951, at site 20 ft upstream at datum 0.9 ft higher.