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Scientific Investigations Report 2012–5017


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Prepared in cooperation with the Molalla River Improvement District


Geomorphic Setting, Aquatic Habitat, and Water-Quality Conditions of the Molalla River, Oregon, 2009–10


By Kurt D. Carpenter, Christiana R. Czuba, Christopher S. Magirl, Mathieu D. Marineau, Steve Sobieszczyk, Jonathan A. Czuba, and Mackenzie K. Keith

Tables

Table 1. Conversion between river-centerline stationing, U.S. Geological Survey topographic map river-mile stationing, and geomorphic flood-plain stationing for the Molalla River, Oregon.


Table 2. Sites sampled on the Molalla River, Oregon, and details of specific data collected during July–October 2010.


Table 3. Summary of data used to assess the peak-discharge record for the Molalla River, Oregon.


Table 4. Discharge values of given annual exceedance probabilities for peak flows for the Molalla River using data from U.S. Geological Survey gaging station at Canby, Oregon.


Table 5. Upstream and downstream extents of the six geomorphic reaches along the lower Molalla River, Oregon.


Table 6. Residual pool depth summary statistics by geomorphic reach in the Molalla River, Oregon, for residual pools greater than 1.0 meter.


Table 7. Aerial imagery used in spatial analysis of the Molalla River, Oregon, flood plain.


Table 8. Diel field parameter data and diel ranges in the main-stem Molalla River, Oregon, August–September 2010.


Table 9. Nutrient concentration data for the main-stem Molalla River, Oregon, 2010.


Table 10. Nutrient concentrations for reference streams in the Cascade Range and Williamette Valley, Oregon, and nutrient and algal criteria to prevent nuisance conditions in streams.


Table 11. Periphyton biomass and qualitative descriptions of benthic communities in the main-stem Molalla River, Oregon, July–August 2010.


Table 12. Autecological preferences and indicator qualities of algal taxa identified in the Molalla River, Oregon, July and August 2010.


Table 13. Diatom indicator species (guilds) in the Molalla River, Oregon, July and August 2010.


Table 14. Physical characteristics for five sites sampled for water quality and algae in the Molalla River, Oregon.


Table 15. Summary of BEST variables and top models explaining patterns in diatom species relative abundance in the Molalla River, Oregon, July and August 2010.


First posted February 29, 2012

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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