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Thomas R. Payne & Associates is now part of the employee owned Normandeau Associates team.  We are the same professional staff with the expanded resources of a nationally recognized company providing high quality, practical environmental solutions.  Visit our Normandeau website also.

Fisheries Biology, Consulting, and Software Publishing
890 L Street, Arcata, California USA 95521
P.O. Box 4678, Arcata, California USA 95518
(707) 822-8478  FAX 707 (822)-8842

Thomas R. Payne and Associates Fisheries Consulting

Thomas R. Payne & Associates is a fisheries consulting firm with extensive experience in the analysis of instream flow needs, the impacts of water resource project development on fishery resources, and fisheries monitoring.  Visit the fisheries consulting main page for information about the firm, past projects, publications, staff biographies, and downloadable reference data (e.g. HSC).  TRPA has been conducting fisheries and instream flow studies for over 23 years.  Being a mature small company of six experienced and dedicated fisheries biologists enables TRPA to keep overhead costs at a minimum.  Consequently our rates are some of the most competitive in the industry.  TRPA’s close proximity to Humboldt State University and its nationally known School of Natural Resources and Sciences provides TRPA with assistance from eminent professors, experienced and dedicated graduate student labor, and the resources of an extensive fisheries library.  With our competitive rates, experienced personnel, and flexible work force, we can ensure quality data collection and analysis for large and small fisheries projects.  Our competitive rates enable TRPA to send senior, experienced fisheries biologists to your project at a cost similar to other company’s technician rates.  Quality, efficient field data collection is important!  Contact us at for more information.

Thomas R. Payne and Associates Software

RHABSIM (Riverine HABitat SIMuation) is a fully integrated program for river hydraulics and aquatic habitat modeling using the Instream Flow Incremental Methodology (IFIM). Running in Microsoft Windows and DOS, it is an extensive conversion of the PHABSIM hydraulic and habitat simulation system developed by the U. S. Fish and Wildlife Service.

StreamTemp: A Simple Network Stream Temperature Model for Windows is a stream temperature model for predicting changes in water temperature from upstream modifications in flow. Running in Microsoft Windows, it is a greatly expanded version of the SNTEMP model developed by the U. S. Fish and Wildlife Service.


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