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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
05437645 ROCK RIVER ABOVE DAM AT ROCKFORD, IL
LOCATION - Lat 42°15'59.5", long 89°05'45.7" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 NW 1/4 sec.26, T.44 N., R.1 E., Winnebago County, IL, Hydrologic Unit 07090005, at the south east corner of the retaining wall in Davis Park along the river.
DRAINAGE AREA - 6,535 mi².
REVISIONS HISTORY -
Revisions: Gage datum was revised to 700.19 ft NAVD88 (700.38 ft NGVD29) on March 29, 2022. Gage datum was previously published in error as 700.00 ft above NGVD of 1929 (699.81 ft NAVD 1988).
Revisions: Gage datum was revised to 700.19 ft NAVD88 (700.38 ft NGVD29) on March 29, 2022. Gage datum was previously published in error as 700.00 ft above NGVD of 1929 (699.81 ft NAVD 1988).
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER STAGE
STAGE: April 2015 to Dec. 7, 2023
Feb. 8, 2024 to current
GAGE -
Water-stage recorder, satellite telemeter, and a crest-stage gage. Datum of gage is 700.19 ft above NAVD of 1988.
Water-stage recorder, satellite telemeter, and a crest-stage gage. Datum of gage is 700.19 ft above NAVD of 1988.
REMARKS - Stages regulated by power plant 19.7 mi. upstream of gage and by the operation of Fordham Dam 0.1 mi. downstream of gage.
EXTREMES FOR PERIOD OF RECORD - STAGE: Maximum gage height, 4.06 ft., March 17, 2019; minimum, 0.18 ft., February 15, 2020.
