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Temporal and Spatial Turbidity Patterns Over 

30 Years in a Managed Forest of Western 

Washingtonâ€

1. Maryanne Reiter1, 

2. John T. Heffner2, 

3. Storm Beech2, 

4. Ted Turner1, 

5. Robert E. Bilby3

Article first published online: 20 APR 2009

DOI: 10.1111/j.1752-1688.2009.00323.x

Â© 2009 American Water Resources Association

Issue 

JAWRA Journal of the American Water Resources Association

Volume 45, Issue 3, (/doi/10.1111/jawr.2009.45.issue-3/issuetoc) pages 793â€“808, June 2009

Additional Information

How to Cite

Reiter, M., Heffner, J. T., Beech, S., Turner, T. and Bilby, R. E. (2009), Temporal and Spatial Turbidity Patterns Over 

30 Years in a Managed Forest of Western Washington. JAWRA Journal of the American Water Resources 

Association, 45: 793â€“808. doi: 10.1111/j.1752-1688.2009.00323.x

Author Information

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1

2

3

â€ 

Keywords:

turbidity; sediment; monitoring; time series analysis; forest practices

Respectively, Hydrologist (Reiter) and Geologist (Turner), Weyerhaeuser Company, Environmental Forestry 

Research, 785 N. 42nd Street, Springfield, Oregon 97478

Environmental Forestry Research Technicians (Heffner, Beech), Weyerhaeuser Company, 505 N. Pearl 

Street, Centralia, Washington 98531

Senior Scientific Advisor (Bilby), WTC 1A5, 32901 Weyerhaeuser Way S, Federal Way, Washington 98001.

*

(E-Mail/Reiter: maryanne.reiter@weyerhaeuser.com (mailto:maryanne.reiter@weyerhaeuser.com))

Paper No. JAWRA-07-0155-P of the Journal of the American Water Resources Association (JAWRA). 

Discussions are open until six months from print publication.

Publication History

1. Issue published online: 26 MAY 2009

2. Article first published online: 20 APR 2009

3. Received November 8, 2007; accepted December 9, 2008.

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Abstract:â€‚ Forest practices have progressively changed over the last 30 years in the Pacific Northwest to address water quality concerns. There have been 

some assessments of these new management practices made at a site scale but very few studies have attempted to evaluate their efficacy at reducing 

cumulative sediment production at a watershed scale. Such an evaluation is difficult due to the spatial and temporal variability in sediment delivery and 

transport processes. Due to this inherent variability, detecting a response to management changes requires a long-term data record. We utilized a water quality 

dataset collected over 30 years at four locations in the Deschutes River watershed (western Washington) to assess trends in turbidity and whether sediment 

control procedures implemented over this time period had any detectable influence. The sample sites ranged from small headwater streams (2.4 and 3.0 km2) 

to the mainstem of the Deschutes River (150 km2). Declining trends in turbidity were detected at all the permanently monitored sites. The mainstem 

Deschutes River site, which integrates sediment processes from the entire study watershed, showed dramatic declines in turbidity even with continued active 

forest management. For the small basins, logging and road construction occurred in the 1970s and 1980s and turbidity declined thereafter, achieving 

prelogging levels by 2000. There are no temporal trends in flow that could be responsible for the observed trends in turbidity. Our results suggest that 

increased attention to reducing sediment production from roads and minimizing the amount of road runoff reaching stream channels has been the primary 

cause of the declining turbidity levels observed in this study.

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