Last Updated: June 28, 2025 - 8:00 AM Our current water level at The Alton Marina is 416.50 ft. (6' +/-. within the harbor).  The most current USACE water forecast is predicting water levels over the next 5 days near 416 - 417 elevation. Please see the USACE forecast data in the links below. 

Positioned at Mile Marker 203, we are the last stop for fuel on the river before Kimswick if you're traveling south on the Mississippi.  All of our Fuel & Gas is treated with Valvtect fuel additive. Current Fuel/Gas Prices - 2024: Gasoline (87 Octane) - $4.159 per gallon Diesel- $4.45.9 per gallon *Contract Slip

Discounts For Members of Boat U.S., Marina Life and America's Great Loop Cruisers' Association (AGLCA), we offer a discount on fuel. Show us your membership card receive $0.10/gal discount. 6 & 12 Month Slip Holders save $0.15/gal at fuel dock, plus free pump out service. Anniversary Party Dockage Special for All Boaters (08/24) -