Stream Crossing Survey Results
A total of 105 crossings were surveyed, including 12 bridges, 92 culverts and one dam. Survey locations were in the town of Hazelhurst (n=7), Lake Tomahawk (n=2), Little Rice (n=32), Lynne (n=33), Minocqua (n=26), and Woodruff (n=5). Of the 105 crossings, 97 (87.6%) created at least a partial barrier to fish passage, with 15 (15.2%) posing a complete barrier. A portion of structures (7.6 %) presented no barrier to aquatic organisms. A common crossing design flaw is stream constriction, calculated as the ratio of structure width to average stream bed width. Optimally, the structure should measure at least half the width of the stream bed. We found 63.8% (n=67) of crossings causing significant stream constriction.
Structures that are not placed at a proper depth in relation to the stream bed result in a water depth insufficient for fish passage, observed at 72.4% (n=76) of crossings. In general, condition of structures was a minor issue, with 3.8% (n=4) showing major to severe deterioration. Erosion is a common occurrence, especially during heavy rain events; 13 crossings (12.4%) were evaluated with erosion levels of 2 tons per year or greater (J. Simonsen, personal communication, November 11, 2020). You can read the complete report by clicking on the button below.
Structures that are not placed at a proper depth in relation to the stream bed result in a water depth insufficient for fish passage, observed at 72.4% (n=76) of crossings. In general, condition of structures was a minor issue, with 3.8% (n=4) showing major to severe deterioration. Erosion is a common occurrence, especially during heavy rain events; 13 crossings (12.4%) were evaluated with erosion levels of 2 tons per year or greater (J. Simonsen, personal communication, November 11, 2020). You can read the complete report by clicking on the button below.
Individual Town Reports can be viewed below.
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For additional information see below:
https://www.uwsp.edu/cnr-ap/UWEXLakes/Documents/ecology/shoreland/background/fish friendly_culverts.pdf
All completed survey data may be viewed at the Michigan DNR HUB site
https://great-lakes-stream-crossing-inventory-michigan.hub.arcgis.com
(scroll to bottom of page, access surveys using the Stream Crossing Viewer or the Stream Crossing Dashboard)
AND
Oneida County Interactive Land and Water Mapping app
https://www.co.oneida.wi.us/departments/li/land-records-system/
https://www.uwsp.edu/cnr-ap/UWEXLakes/Documents/ecology/shoreland/background/fish friendly_culverts.pdf
All completed survey data may be viewed at the Michigan DNR HUB site
https://great-lakes-stream-crossing-inventory-michigan.hub.arcgis.com
(scroll to bottom of page, access surveys using the Stream Crossing Viewer or the Stream Crossing Dashboard)
AND
Oneida County Interactive Land and Water Mapping app
https://www.co.oneida.wi.us/departments/li/land-records-system/