References

Kaufmann, P.R., P. Levine, E.G. Robison, C. Seeliger, and D. Peck. 1999. Quantifying physical habitat in wadeable streams. EPA/620/R-99/003. Washington, DC: U.S. Environmental Protection Agency.  https://nepis.epa.gov/Adobe/PDF/300042RU.pdf (PDF) (150 pp, 673K).

Kaufmann, P.R., J.M. Faustini, D.P. Larsen, and M.A. Shirazi. 2008. A roughness-corrected index of relative bed stability for regional stream surveys. Geomorphology 199:150-170.

Kaufmann, P.R., D.P. Larsen, and J.M. Faustini, 2009. Bed stability and sedimentation associated with human disturbances in Pacific Northwest streams. J. Am. Water Resources Assoc. 45(2):434-459.

Omernik, J.M. 1987. Ecoregions of the conterminous United States. Map (scale 1:7,500,000). Ann. Assoc. Am. Geog. 77(1):118-125.

U.S. EPA (United States Environmental Protection Agency). 2020a. National Rivers and Streams Assessment 2013-2014: A collaborative survey. EPA 841-R-19-001. https://www.epa.gov/sites/default/files/2020-12/documents/nrsa_2013-14_final_report_2020-12-17.pdf.

U.S. EPA. 2020b. National Rivers and Streams Assessment 2013-2014: Technical support document. EPA 843-R-19-001. https://www.epa.gov/sites/default/files/2020-12/documents/nrsa_2013-14_final_tsd_12-15-2020.pdf.

U.S. EPA. 2016a. National Rivers and Streams Assessment 2008-2009: A collaborative survey. EPA 841-R-16-007. https://www.epa.gov/sites/production/files/2016-03/documents/nrsa_0809_march_2_final.pdf.

U.S. EPA. 2016b. National Rivers and Streams Assessment 2008-2009: Technical report. https://www.epa.gov/sites/default/files/2016-03/documents/nrsa_08_09_technical_appendix_03082016.pdf.

U.S. EPA. 2012. Level III ecoregions of the conterminous United States. Updated 2021. https://catalog.data.gov/dataset/u-s-level-iii-and-iv-ecoregions-u-s-epa.