Where: Iowa · approx. 40.63, -91.32 (vicinity only)
Why this spot: 1880s+ Sanborn-mapped town on Mississippi River on a low straight reach; historic penitentiary and riverfront industry town
What turns up: Brewery blob-top beers, Fort Madison soda and bottling Hutchinsons, embossed druggists, stoneware crocks, and riverfront industrial glass
Access: Gray area.
The Mississippi is navigable, so the riverbed below the ordinary high-water mark is state public-trust land where artifact removal is restricted. Riverbank and townsite uplands are generally private and need the landowner's permission. Iowa law protects archaeological sites and unmarked burials.
Open in Mudlark Map →
Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.
Pins are approximate by design. This page is historical research, not permission to dig. Check ownership and local law first.