USGS Water-Year Summary 2021
07124200 PURGATOIRE RIVER AT MADRID, CO
LOCATION - Lat 37°07'46", long 104°38'22" referenced to North American Datum of 1927, in SW 1/4 NE 1/4 sec.35, T.33 S., R.65 W., Las Animas County, CO, Hydrologic Unit 11020010, on left bank 70 ft downstream from county road bridge, 0.3 mi northeast of Madrid, 1.0 mi downstream from Burro Canyon, and 9 mi west of Trinidad.
DRAINAGE AREA - 505 mi².
PERIOD OF RECORD - March 1972 to current year.
GAGE - Water-stage recorder with satellite telemetry and crest-stage gage. Datum of gage is 6,261.61 ft above NGVD of 1929 (U.S. Army Corps of Engineers bench mark).
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 14,300 ft³/s, July 20, 1976, from timed-drift measurement of peak flow, gage height, 12.80 ft, from floodmarks.