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

2. 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

3. 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

4. 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

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

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

7. 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

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

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

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

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

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

13. 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.

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

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

16. 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

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

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

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

20. 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?