Fish Passage Restoration at Roy’s Pools Lagunitas Creek TAC Meeting November 3, 2017

TAC Meeting Outline Topics to Cover Project History and Background Roy’s Pools Problems and Need for Intervention Project Goals and Objectives Site Conditions and Geomorphic Setting Design Alternatives Considered Preferred Alternative Selected Design Plans: Channel Profile and Key Features Example Projects Acknowledgments Q/A

Project History Roy’s Dam into Roy’s Pools 1998 Broken concrete apron replaced with 4 weirs of metal sheet piling Landowner and funding constraints limited scope Fish ladder remained

Roy’s Pools Today: Plagued with Problems Migration barrier for juvenile salmonids Smolt outmigration stranding and dying from subsurface flow Water quality: low DO, high temperatures Fish rescue consistently needed

Fish Passage Restoration at Roy’s Pools Goals & Objectives Fish Passage Restoration at Roy’s Pools

Fish Passage Restoration at Roy’s Pools Existing Conditions Fish Passage Restoration at Roy’s Pools

Fish Passage Restoration at Roy’s Pools Geomorphic Assessment Fish Passage Restoration at Roy’s Pools Key findings and observations Profile is typically between 0.6% and 0.7% within the study area Channel within the reach is typically incised by 5 to 10 feet Roy’s Pools structure creates backwater effect that influences sediment and substrate Average bankfull dimensions ~30 feet wide 3 to 5 feet deep Channel above Roy’s Pools structure appears to be attempting to meander: inset bars and terraces Profile control from the Roy’s Pools structure and bedrock expression Stream wood influences habitat and site scale morphology

Fish Passage Restoration at Roy’s Pools Geomorphic Assessment Fish Passage Restoration at Roy’s Pools

Fish Passage Restoration at Roy’s Pools: Alternative 1 Alternatives Fish Passage Restoration at Roy’s Pools: Alternative 1 Lagunitas TAC Meeting Friday, November 3 23017

Fish Passage Restoration at Roy’s Pools: Alternative 2 Alternatives Fish Passage Restoration at Roy’s Pools: Alternative 2 Lagunitas TAC Meeting Friday, November 3 23017

Fish Passage Restoration at Roy’s Pools: Alternative 3 Alternatives Fish Passage Restoration at Roy’s Pools: Alternative 3

Fish Passage Restoration at Roy’s Pools Alternatives Fish Passage Restoration at Roy’s Pools Within Marin County Right-of-Way

Fish Passage Restoration at Roy’s Pools Preffered Alternative Selection Fish Passage Restoration at Roy’s Pools Preferred alternative (Alternative 3) selected for: Limited ecological impact to existing riparian conditions Benefits to winter and summer rearing habitat Variability in the profile (pools), potential for suitable spawning habitat via sorting of substrate for redds Habitat heterogeneity: channel structures, backwater Golf course operations and playability Cost savings associated with smaller grading footprint * Preferred alternative was subsequently advanced to final design.

Fish Passage Restoration at Roy’s Pools Final Design Fish Passage Restoration at Roy’s Pools

Fish Passage Restoration at Roy’s Pools Final Design Fish Passage Restoration at Roy’s Pools

Fish Passage Restoration at Roy’s Pools Final Design Fish Passage Restoration at Roy’s Pools Key Design Elements: Large Wood Flow Obstruction Toppled Tree Sedge Boulder Cluster Brush Mat Vegetated Rock Slope

Fish Passage Restoration at Roy’s Pools Analogs and Examples Fish Passage Restoration at Roy’s Pools

Fish Passage Restoration at Roy’s Pools Analogs and Examples Fish Passage Restoration at Roy’s Pools

Fish Passage Restoration at Roy’s Pools Hydrology Fish Passage Restoration at Roy’s Pools

Fish Passage Restoration at Roy’s Pools Acknowledgements: CDFW FRGP SPAWN (Preston Brown) Gayle Seymour (CDFW) Matt Erickson (CDFW) Majorie Caisley, PE (CDFW) Marcin Whitman, PE (CDFW) Questions?