Marysville and the northern reaches of Everett are defined by the complex aquatic landscape where the Snohomish River meets Possession Sound. This environment is characterized by a dense network of waterways, including Steamboat Slough, Union Slough, and Ebey Slough, which isolate a series of landmasses like Smith Island and Spencer Island. The transition from the urban grid of Everett to the expansive wetlands and sloughs highlights the area's importance as an estuarine hub.
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1895 · Snohomish
USGS Topo · 1:125,000
1897 · Seattle
USGS Topo · 1:125,000
1911 · Mount Vernon
USGS Topo · 1:125,000
1941 · Marysville
USGS Topo · 1:62,500
1942 · Edmonds
USGS Topo · 1:62,500
1943 · Marysville
USGS Topo · 1:62,500
1943 · Stanwood
USGS Topo · 1:62,500
1944 · Everett
USGS Topo · 1:62,500
1953 · Snohomish
USGS Topo · 1:24,000
1953 · Mukilteo
USGS Topo · 1:24,000