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USGS Water-Year Summary 2024
09402500 COLORADO RIVER NEAR GRAND CANYON, AZ
LOCATION - Lat 36°06'05", long 112°05'08" referenced to North American Datum of 1927, in sec.05, T.31 N., R.3 E., Coconino County, AZ, Hydrologic Unit 15010001, in Grand Canyon National Park, on left bank 0.2 mi upstream from Kaibab Bridge, 0.4 mi upstream from Bright Angel Creek, 4.5 mi northeast of village of Grand Canyon, 26 mi downstream from Little Colorado River, and 267 mi upstream from Hoover Dam.
DRAINAGE AREA - 141,600 mi² of which 3,959 mi² probably is noncontributing. in the Great Divide basin in southern Wyoming.
REVISIONS HISTORY - The maximum gage height, maximum discharge, and date of the peak for water year 1884 were revised on September 9, 2024. Prior to September 9, 2024, no peak gage height was associated with the 1884 flood. In 1938, a high-water mark at a stage of 37.5 ft was incorrectly assigned to the 1921 flood. The high-water mark at a stage of 37.5 ft is associated with the 1884 flood as of September 9, 2024. The original USGS peak discharge estimate was incorrectly determined to be 300,000 ft3/s in 1938. The month and day of the event were also removed, as there are contradicting reports and no clear evidence for a specific date.
The maximum gage height and maximum discharge for water year 1921 were revised on September 9, 2024. In 1938, a high-water mark at a stage of 37.5 ft was incorrectly assigned to the 1921 flood. The original USGS peak discharge was incorrectly determined to be 220,000 ft3/s in 1938.
See USGS Professional Paper 1677 for additional information about the 1884 and 1921 water year peaks.
The maximum gage height and maximum discharge for water year 1921 were revised on September 9, 2024. In 1938, a high-water mark at a stage of 37.5 ft was incorrectly assigned to the 1921 flood. The original USGS peak discharge was incorrectly determined to be 220,000 ft3/s in 1938.
See USGS Professional Paper 1677 for additional information about the 1884 and 1921 water year peaks.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Oct. 1922 to current year. Prior to 1944, published as "Colorado River at Bright Angel Creek, near Grand Canyon." Gage-height records collected 1.5 mi downstream 1908-1913, published in reports of U.S. Weather Bureau.
GAGE - Water-stage recorder. Datum of gage is 2,418.7 ft above sea level.
REMARKS - Flow regulated by Lake Powell, 104 mi upstream, since Mar. 13, 1963. (See elsewhere in this report.) Many diversions above station for irrigation, municipal, and industrial uses.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge since at least 1884, 300,000 ft³/s about July 8, 1884 (computed on basis of flood studies at Lees Ferry). Crest discharge of flood of June 19, 1921, was 220,000 ft³/s, gage height, 37.5 ft from floodmarks, from rating curve extended above 120,000 ft³/s.
EXTREMES FOR PERIOD OF RECORD - 1922-1962: Maximum discharge, 127,000 ft³/s, July 2, 1927, gage height, 29.25 ft; minimum, 700 ft³/s Dec. 28, 1924, gage height, -0.70 ft.
1963-2017: Maximum discharge, 96,200 ft³/s, June 29, 1983, gage height, 26.26 ft; minimum, 850 ft³/s, Jan. 26, 1963, gage height, -0.55 ft, result of closing coffer dam at Glen Canyon Dam.
