Step-Pool Creation to Restore Fish Passage and Riparian Health
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1 Step-Pool Creation to Restore Fish Passage and Riparian Health Jenny Kindig Water Resources Engineer Denny Mengel, Senior Environmental Scientist Steve Miller, Water Resources Engineer Gloria Beattie, Water Resources Engineer Project Background Reconstructing Utah Forest Highway 39 through Fishlake National Forest Led by FHWA in cooperation with Sevier County and the U.S. Forest Service 1
2 Mitigation Flow Step-Pool Feature Step-Pool Channel instability caused by inadequate hydraulic capacity of existing culvert 2
3 Design Details - Step-Pool Matches existing channel geometry Invert elevation drop (2.4 meters) Channel length (38.6 meters) Slope (0.063) Meets fish passage criteria 0.3 meters Morphometric features 1 <{(H/L) average / S} < 2 Abrahams et al., 1995 Design Details - Step-Pool Existing bankfull channel geometry Bottom width (2.7 meters) Top width (4.6 meters) Depth (1.1 meters) Step-pool channel geometry Bottom width (3 meters) Channel and overbank side slopes (3:1) Depth (1.0 meter over crests, 1.25 meter over pools) 3
4 Design Details - Step-Pool Final proposed configuration: 9 crests / 8 pools over the 40-meter reach Pool spacing of 4.9 meters 0.3-meter elevation drop from pool-crest to pool-crest Design Details - Step-Pool Final proposed configuration: Boulder structures extend to the bankfull (1.5-year return interval discharge) stage elevation Extend rock sill or key up to 2-feet above the 100-year discharge 4
5 Design Details - Step-Pool Rock riprap and live willow cuttings Riprap sized to accommodate 100-year and 500-year flood events Step-pool crests and footer rocks consist of 1-meter boulders Live willow stakes and deciduous tree plantings for long-term stability Mitigation Required to compensate for road realignments and several crossings of Gooseberry Creek Mitigation site is degraded reach upstream from culvert Livestock grazing Downstream undersized culvert 5
6 Channel Characteristics E5 Rosgen stream type Bank Failure Bank Protection ~198 meters of shoreline protected using local willow cuttings ~17 meters of shoreline protected using willow fascines or coir logs 6
7 Bank Protection ~11.6 meters of shoreline protected using boulders Woody Species Plantings 13 cottonwoods 3 river birch ~175 square meters of riparian area planted using willow cuttings 7
8 Riparian Herbaceous Vegetation Planting of ~242 square meters Upland Restoration Restoration of ~226 square meters of degraded oak communities Site Fencing Performance Criteria Riparian and upland vegetation monitoring Percent canopy cover, survival, no invasive weed species Monitoring Methods Baseline (before construction) Yearly monitoring Final measurements (Year 5) 8
9 Design Summary Site improvements Step-pool feature Slope stabilization Revegetation of riparian and upland areas Relies on bioengineering wherever possible, and only uses rock revetments where necessary Construction and Implementation Construction of roadway began in October 2004 Two-year schedule for entire roadway project 9
10 Questions? 10
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