Disclaimer

Information displayed on this map is for general reference purposes only and is not suitable for site-specific decision making. While every effort has been made to ensure the accuracy of the mapped features, the City of Algona makes no representation or warranty as to the accuracy, extent, or location of any mapped features. Potential wetlands and streams were mapped based on a review of existing data sources and a reconnaissance-level field effort.

The City of Algona shall not be held liable for any and all damage, loss, or liability that arises from this product or use thereof by any person or entity. All critical area information should be independently verified.

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Using This Map

The control panel on the right allows you to adjust the scale of the map, change the basemap, and select layers. The opacity slider allows you to control the transparancy of the wetland layer and view underlying features.

Below the control panel, you will find tools for measuring and drawing on the map. These drawing features will only display in the current browsing sesssion, and will not be saved or viewed by others. The edit button allows you to modify drawn features, and the trash button removes seclected features from the map. These tools will not modify the Critical Areas layers.

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Hazard Areas

Erosion and landslide hazard area data was provided by permission of King County.

Erosion Hazard Areas
Erosion hazard areas are at least those areas identified by the U.S. Department of Agriculture’s Natural Resources Conservation Service as having a “moderate to severe,” “severe,” or “very severe” rill and inter-rill erosion hazard. Erosion hazard areas are also those areas impacted by shore land and/or stream bank erosion and those areas within a river’s channel migration zone (AMC 16.18E.020[A]).


Landslide Hazard Areas
Landslide hazard areas are areas potentially subject to landslides based on a combination of geologic, topographic, and hydrologic factors. They include areas susceptible because of any combination of bedrock, soil, slope (gradient), slope aspect, structure, hydrology, or other factors (AMC 16.18E.020[B]).

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Wetland Areas

Clicking on a wetland feature will display additional classification information

Cowardin Classification

PEM (Palustrine Emergent)
Nontidal wetlands, or tidal wetlands with salinity below 0.5 parts per thousand, dominated by erect, rooted, herbaceous hydrophytes.

PSS (Palustrine Scrub-Shrub)
Nontidal wetlands, or tidal wetlands with salinity below 0.5 parts per thousand, dominated by woody plants less than 20 feet tall.

PFO (Palustrine Forested)
Nontidal wetlands, or tidal wetlands with salinity below 0.5 parts per thousand, dominated by trees at least 20 feet tall.

PUB (Palustrine Unconsolidated Bottom)
Nontidal wetlands, or tidal wetlands with salinity below 0.5 parts per thousand, with at least 25 percent cover of particles smaller than stones and a vegetative cover less than 30 percent.

Source: Cowardin, L.M., V. Carter V., F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. U.S. Fish and Wildlife Service Report No. FWS/OBS/-79/31.Washington, D.C.

Hydrogeomorphic Classification

Depressional
Depressional wetlands occur in topographic depressions where the elevation of the surface within the wetland is lower than in the surrounding landscape. The movement of surface water and shallow subsurface water is toward the lowest point in the depression. The depression may have an outlet, but the lowest point in the wetland is somewhere within the boundary, not at the outlet.