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Illinois River at Lockport Lock and Dam (POOL)
Gage Zero: 0 Ft. IGLD
Longitude: 0
Latitude: 0
River Mile: 291.1 miles above the mouth of the Illinois River
Location of Gage :

The Pool Elevation is referenced to International Great Lakes Datum (IGLD).  To convert to NGVD 1929, add 1.3 feet.

The Tailwater Elevation is referenced to NGVD 1929 Datum.

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Additional Links:
US Army Corps of Engineers - Rock Island District - Water Control Center - Contact Us