This data shows streams in the current range of Hungerford's Crawling Water Beetle (Brychius hungerfordi; HCWB) that may contain suitable habitat. Suitability is based on average July temperature, baseline flow, network catchment soil permeability, and a habitat model. Additional streams not shown in this data may also contain suitable habitat for HCWB.
This data file displays streams within the current range of HCWB that may contain suitable habitat for HCWB. This stream layer was built based on data from Michigan DNR, US Geological Survey, and US Fish and Wildlife Service. The map is based on stream temperatures, flow rates, network catchment soil permeability, and relative habitat suitability based on a Maxent model created by Dr. Arthur Cooper at Michigan State University and Dr. Kevin Wehrly at Michigan DNR. Only perennial streams are included. Streams were selected based on being categorized as cold, cold transitional, or warm transitional, having a flow rate between 2 and 215 cfs, within catchments with a soil permeability rate between 3.36 and 13.16 micrometers/day, and were modeled as moderate or highly suitable for the species in a relative habitat suitability model. In some cases, adjoining stream segments to those having those characteristics were manually added. Any stream where HCWB is known to present not captured by those characteristics was also manually added. Streams where surveys have concluded HCWB habitat was not present were also manually removed. This layer was last updated in January 2026.
This data file also displays stream segments where HCWB have been detected within 1 mile. The HCWB_1mi attribute value is no if HCWB have not yet been detected within 1 mi, and yes if HCWB have been detected within 1 mi. It is recommended to use this attribute to assign symbology.
This layer was last updated in January 2026.
U.S. Fish and Wildlife Service, Region 3, Michigan Ecological Services Office, Michelle Kane
The United States Fish and Wildlife Service (Service) shall not be held liable for improper or incorrect use of the data described and/or contained herein. While the Service makes every reasonable effort to ensure the accuracy and completeness of data provided for distribution, it may not have the necessary accuracy or completeness required for every possible intended use. The Service recommends that data users consult the associated metadata record to understand the quality and possible limitations of the data. The Service creates metadata records in accordance with the standards endorsed by the Federal Geographic Data Committee.
As a result of the above considerations, the Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of the data. It is the responsibility of the data user to use the data in a manner consistent with the limitations of geospatial data in general and these data in particular. Although these data have been processed successfully on a computer system at the Service, no warranty, expressed or implied, is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This applies to the use of the data both alone and in aggregate with other data and information.
Inherent in any data set used to develop graphical representations, are limitations of accuracy as determined by, among others, the source, scale and resolution of the data. USFWS gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. In addition, the USFWS shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data are meant to be used to show potential stream reaches where HCWB may occur. HCWB may also occur in other stream reaches not identified in this data.
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