Trap Count Statistics

These data are compiled by the Department of Marine Resources (DMR) using fishway counts provided by agencies, power companies, and a harvester. "NC" indicates a species is not counted at that location. Fish returns should be considered as provisional.

These fish counting facilities are typically operated from May through early November each year. Staff update the statewide trap catch summary weekly or more often during the peak of the fish migrations. The statewide trap catch table includes counts of sea-run salmon captured on Maine rivers and salmon removed from the river as broodstock for restocking of Maine rivers and DOES NOT include captures of aquaculture strays or captive reared adult salmon released from Federal hatcheries.

Historical annual data for 2011 – 2021 (PDF file, 4 pages)

Recent Trap Counts for Fish Returns to Maine by River
River Trap Location Am.Shad At.Salmon (MSW) At.Salmon (grilse) River Herring Striped Bass Sea Lamprey Trap Opened Trap Closed Updated
Androscoggin Brunswick
228
8
9
139326
0
370
April 29
0
September 26, 2022
Aroostook Tinker Dam
NC
0
0
NC
NC
NC
July 4
September 23, 2022
Kennebec Benton Falls
3
5
0
2779209
0
61
July 23, 2022
Kennebec Lockwood Dam
5
47
34
83978
52
7
May 1
0
September 26, 2022
Narraguagus Cherryfield
412
11
7
NC
0
0
April 26
August 29, 2022
Penobscot Milford fish lift
7582
1264
N/A
2852037
48
6535
April 15
September 26, 2022
Penobscot Orono
2
4
0
239500
0
1019
April 15
September 26, 2022
Penobscot Weldon Dam
NC
NC
NC
NC
NC
NC
April 28
September 26, 2022
Saco Cataract (East + West Channels)
1092
2
2
157073
34
0
April 29
August 21, 2022
Saco Skelton
22
2
0
149130
1
0
April 29
August 21, 2022
St. Croix Milltown Dam
0
0
0
712670
0
0
June 27, 2022
Union Ellsworth
2
0
0
1187460
0
0
May 1
September 26, 2022

Atlantic salmon MSW = multi sea winter (≥ 63 cm fork length); grilse = one sea winter (< 63 cm fork length)
River herring counts = combined count of alewife and blueback herring

Data Sources and Details
River Trap Location Sources and Details
Androscoggin Brunswick Counts conducted by DMR and Brookfield Renewable Energy Group.
Aroostook Tinker Dam Counts provided by Algonquin Power.
Kennebec Benton Falls Counts conducted by DMR.
Kennebec Lockwood Dam Counts provided by Brookfield Renewable Energy Group.
Narraguagus Cherryfield Counts provided by MDMR. River herring and small bodied(
Penobscot Milford fish lift Due to trap operations grilse will be added to the MSW counts. Counts provided by MDMR
Penobscot Orono Counts provided by Brookfield Renewable Energy Group.
Penobscot Weldon Dam Counts provided by Brookfield Renewable Energy Group. River herring were documented in the fishway, but no counts are provided.
Saco Cataract (East + West Channels) Counts provided by Brookfield Renewable Energy Group. West Channel:0 river herring & 0 American shad
Saco Skelton Counts provided by Brookfield Renewable Energy Group.
St. Croix Milltown Dam Counts provided by St. Croix International Waterway Commission.
Union Ellsworth Counts provided by Brookfield Renewable Energy Group.

Atlantic Salmon Trap Protocols (PDF file, 44 pages)

Atlantic Salmon Aquaculture Escape Protoco (PDF file, 17 pages)