United States Department of the Interior, Oscar L. Chapman, Secretary- 

 Fish and Wildlife Service, Albert M. Day, Director 



Special Scientific Report: Fisheries No. 6fj 



A FISHWAY THAT SHAD ASCEND 



By Gerald B. Collins 

 Fishery Biologist 



CONTENTS 



Page 



Introduction 1 



History and Description of Fishway 1 



The Shad Run at Lawrence 



Model Study h 



Summary 5 



Data 6 



Illustrations 



Figure 



1. Plan of Lawrence Fishway 7 



2. Profile of Lawrence Fishway 8 



3. Location of Lawrence Fishway 9 



h. General View of Lawrence Fishway 10 



5. Water Conditions at Fishway Entrance 10 



6. General View of Lawrence Fishway 11 



7. Flooded Fishway Entrance 11 



8. General View of Lawrence Fishway 12 



9. Close-up of Fishway Entrance 12 



10. View of Lawrence Fishway Facing Downstream 13 



11. Notched Weir 13 



12. Diagram of Flow Pattern in Lawrence Fishway lU 



13. General View of Fishway Model - (Alden 



Hydraulic Laboratory) 15 



111. Entrance to Fishway (Model) l6 



15. Entrance to Fishway (Model) 16 



16. Jet from Notched Weir 17 



17. Flow through Notched Weir 17 



