SLIDE 1
WRIA 9 Watershed Ecosystem Forum Adaptive Management Plan Report Presentation
Large Wood, Wood Jam, & Pool Conditions in the Green River Watershed
Presented by Tyler Patterson Fisheries Biologist Tacoma Public Utilities – Water Division 10 February 2011
SLIDE 2 Large Wood, Wood Jam, & Pool Conditions in the Green River Watershed
Baseline large wood (LW), wood jam, and pool condition surveys for each subwatershed:
- Duwamish Estuary – 2004
- Lower Green River – 2004
- Middle Green River – 2006 and 2007
- Upper Green River – 2005
Multi-year LW, wood jam, and pool condition survey comparison for the Middle Green subwatershed:
- LW and wood jam comparison – 2001, 2006, and 2009
- Pool comparison – 2001 and 2007
SLIDE 3
Green River Subwatersheds
SLIDE 4
Baseline Large Wood Density by Subwatershed
SLIDE 5 Baseline Wood Jam Density by Subwatershed
No jams
SLIDE 6
Baseline Pool Density by Subwatershed
SLIDE 7
Baseline Pool Depth by Subwatershed
SLIDE 8
Baseline Wood-Formed Pool Percentage by Subwatershed
SLIDE 9
Multi-Year Comparison of Large Wood Density in the Middle Green Subwatershed
SLIDE 10
Multi-Year Comparison of Wood Jam Density in the Middle Green Subwatershed
SLIDE 11
Multi-Year Comparison of Large Wood Density from RM 57 to RM 61 in the Middle Green Subwatershed
SLIDE 12 Multi-Year Comparison of Wood Jam Density from RM 57 to RM 61 in the Middle Green Subwatershed
No wood jams
SLIDE 13
Multi-Year Comparison of Pool Density in the Middle Green Subwatershed
SLIDE 14
Multi-Year Comparison of Pool Depth in the Middle Green Subwatershed
SLIDE 15
Multi-Year Comparison of Wood-Formed Pool Percentage in the Middle Green Subwatershed
SLIDE 16 Summary
Baseline large wood, wood jam, and pool conditions in Green River subwatersheds:
- Lower Duwamish – low LW density, no jams, pool conditions unknown.
- Lower Green – highest LW density, very few jams. high pool density,
unknown pool depths, very few wood-formed pools.
- Middle Green – moderate LW density, high jam density, low pool
density, very deep bedrock scour pools, several wood-formed pools.
- Upper Green – high LW density, highest jam density, highest pool
density, numerous deep wood-formed pools.
SLIDE 17 Summary continued
Multi-Year Comparison of LW, Wood Jam, and Pool Conditions in the Middle Green Subwatershed:
- Substantial increase in LW and wood jam densities since 2001 through
natural recruitment processes.
- LW placed by Corps since 2004 is substantially increasing LW and jam
densities from RM 57 to RM 61.
- Placed LW has routed downstream as far as RM 39.5, but not forming
jams.
- LW input to the Middle Green River is dominated by natural
recruitment.
- Restoration sites like the Hamikami Levee Breach provide measurable
amounts of LW to the Middle Green River.
- Pool density decreased between 2001 and 2007.
SLIDE 18
References
Anchor Environmental, LLC 2004. Lower Green River Baseline Habitat Survey Report. Prepared for WRIA 9 Technical Committee and King County Department of Natural Resources and Parks – Water and Land Resources Division. Landau Associates and TerraLogic GIS, Inc. 2004. Lower Duwamish Inventory Report. Prepared for WRIA 9 Steering Committee and Seattle Public Utilities. Patterson, T.H. 2010. Middle Green River Large Woody Material Monitoring – 2009 Data Report. Tacoma Public Utilities – Water Division. Tacoma, WA. R2 Resource Consultants. 2002. Green River Baseline Habitat Monitoring – 2001 Data Report. Prepared for U.S. Army Corps of Engineers, Seattle District. Technical Report. R2 Resource Consultants. 2007a. Upper Green River Habitat and Large Woody Debris Monitoring: 2005/2006 Data Report. Prepared for US Army Corps of Engineers. R2 Resource Consultants. 2007b. Middle Green River Large Woody Debris Monitoring: 2006 Data Report. Prepared for Tacoma Public Utilities. R2 Resource Consultants. 2008. Middle Green River Habitat and Large Woody Debris Monitoring: 2007 Data Report. Prepared for US Army Corps of Engineers and Tacoma Public Utilities – Water Division.
