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2020 Map of Knappa

Name: 2020 Topographic Map of Knappa
Creator: U.S. Geological Survey
Published: 2020
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2020

About this map

The Brownsmead dikes and the labyrinthine waterways of the lower Columbia River define this coastal Oregon landscape. Situated where the river meets the tide, the area is a complex network of islands and sloughs, including Karlson Island, Marsh Island, and Horseshoe Island. The settlement of Knappa serves as a gateway to these tidal channels, while the inland terrain rises sharply toward Wick iup Ridge, marked by the drainages of Big Creek and Gnat Creek.

For genealogists and local historians, the map identifies specific community landmarks such as Maplewood Cem and Prairie Cem. The presence of Marsh Island Light and Aldrich Point highlights the maritime significance of the Woody Island Channel and Prairie Channel. Road names like Brownsmead Dike Ln and Knappa Dock Rd reflect the engineering and industry required to manage this estuarine environment, providing a detailed look at the rural infrastructure of Clatsop County.