Great Loop Lock Reference
Reviewed planning reference for lock approach, communications, and float-plan preparation.
Upper Mississippi River / Chain of Rocks Canal
Granite City, IL
Zoomed-in location for this Great Loop lock reference.
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Segment: Upper Mississippi River / Chain of Rocks Canal. Route status: core inland-river route. Approximate coordinate. USACE identifies Lock 27 near the Chain of Rocks Canal; verify phone/VHF before transit. Source: https://www.mvs.usace.army.mil/Missions/Navigation/Locks-and-Dams/Lock-Dam-27/
Continue planning: Check Marine Weather, estimate your trip with the Boat Fuel Calculator, or review the Solo Boating Safety Guide.
