Fishways have opened up hundreds of miles of river to migratory fish in the Connecticut River watershed! We know this because we count the number of fish passing through these structures. Knowing how many fish and what species use these fishways helps us make decisions on how to best restore our migratory fishes.

  • The Leesville Dam on the Salmon River in Connecticut is monitored only for Atlantic salmon. The Salmon River joins the Connecticut River 18 miles upstream of the Long Island Sound.
  • The Rainbow Dam in Connecticut is the first dam on the Farmington River, and is located 8 miles upstream of where the Farmington River joins the Connecticut River. The Farmington River joins the Connecticut River about 57 miles upstream of Long Island Sound.
  • The West Springfield dam (formerly called the DSI Dam) in Massachusetts is the first dam on the Westfield River, and is located 4 miles upstream of where the river joins the Connecticut River. Westfield River joins the Connecticut River 75 miles upstream of the Long Island Sound.
  • The Holyoke Dam in Massachusetts is the first dam on the mainstem of the Connecticut River, and is 87 miles upstream of the Long Island Sound.
  • The Turners Falls Dam fish ladder in Massachusetts is 122 miles upstream of the Long Island Sound; The Vernon Dam fish ladder is located in Vermont, 142 miles upstream of the Long Island Sound.
  • The Bellows Falls Dam fish ladder is located in Vermont, 174 miles upstream of the Long Island Sound.

Connecticut River Basin Fishway Passage Counts

Report Date: 08/18/2022

Fishway, River -
State
Data as of American shad Alewife Blueback herring Atlantic salmon American eel Sea lamprey Striped bass Gizzard shad Shortnose sturgeon Other/ comment
Rogers Lake-CT Final   246               2,506 in 2021
Mary Steube, Mill-CT

 

Final   3,944               20K in 2021
Mill Pond, Falls-CT (NEW Fishway) Final   280                
Moulson Pond, Eightmile-CT 5/10   4 87     1        
Leesville, Salmon-CT Open           76       SL based on nest census
StanChem, Mattabesset-CT Final   2,732 0     3        
Rainbow, Farmington-CT Final 11 1 0 3 4         Setup to trap/pass eel
W. Springfield, Westfield-MA Final 1,288         603       ladder closed 7/15
Holyoke, Connecticut-MA 8/18 190,352   283   1,537 22,233 314 63 19  
Easthampton, Manhan-MA                     Operating unmonitored
**Turners Falls-Gatehouse, Connecticut-MA Final 23,564   2     9,074        
Vernon, Connecticut-VT 6/12 13,611         5,051        
Bellows Falls, Connecticut-VT Not reviewed                    
Total to basin, only first barrier counts   191,651 6,681 370 3 1,541 22,916 314 63 19  
Last year totals   237,355 26,863 3,019 4 12,952 20,650 352 54 11  

 

Report Date: 06/02/2022

Fishway, River -
State
Data as of American shad Alewife Blueback herring Atlantic salmon American eel Sea lamprey Striped bass Gizzard shad Shortnose sturgeon Other/comment
Rogers Lake-CT Final   264                
Mary Steube, Mill-CT

 

Final   3,944               37K in 2020
Mill Pond, Falls-CT (NEW Fishway) Final   160                
Moulson Pond, Eightmile-CT 5/24   2 85     1        
Leesville, Salmon-CT Open                    
StanChem, Mattabesset-CT 4/22   1,561               Image data in review
Rainbow, Farmington-CT Open 2     1            
W. Springfield, Westfield-MA 5/19 751         302       723 white suckers
Holyoke, Connecticut-MA 6/1 170,932   283   781 21,009 149 58 3  
Easthampton, Manhan-MA                     Operating unmonitored
**Turners Falls-Gatehouse, Connecticut-MA 5/21 14,598         787       Gatehouse visitor center open 5/14
Vernon, Connecticut-VT 5/15 522                  
Bellows Falls, Connecticut-VT Opened 5/19                    
Total to basin, only first barrier counts   171,685 5,507 368 1 781 21,312 149 58 3  
Last year totals   237,355 26,863 3,019 4 12,952 20,620 352 54 11  

 

Report Date: 07/21/2021

Fishway, River -
State
Data as of American shad Alewife Blueback herring Atlantic salmon American eel Sea lamprey Striped bass Gizzard shad Shortnose sturgeon Other/comment
Rogers Lake-CT Final   2,507                
Mary Steube, Mill - CT

 

Final   20,731                
Moulson Pond, Eightmile-CT Final   934 1,179             record # of ALE, been trucking
Leesville, Salmon-CT Open                    
StanChem, Mattabesset-CT Final 2 5,198 598         19   prv record #, was 460
Rainbow, Farmington-CT Final 47     3 7 470        
W. Springfield, Westfield-MA Closed                   video in review
Holyoke, Connecticut-MA 6/29 237,072   1,242   10,734 20,479 352 35 11 Closed 6/30 for repair work thru summer
Easthampton, Manhan-MA Open                    
**Turners Falls-Gatehouse, Connecticut-MA 6/28 21,066   4     11,226       ladders closed 6/30 and 7/1
Vernon, Connecticut-VT 5/29 6,476       689 4,732        
Bellows Falls, Connecticut-VT 5/29 222         844        
Total to basin, only first barrier counts   237,121 26,863 3,019 3 10,741 20,949 352 54 11  
Last year totals   368,482 38,056 931 0 17,695 37,399 452 96 18  

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