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Salmon counts at the Big Bar landslide site

The following table highlights fish movement below and above the Big Bar landslide site in 2023. Two types of monitoring methods were used to track fish passage at Big Bar – hydroacoustic SONARs and radio tagging. More information about these methods is available here.

For 2023, the Big Bar monitoring program focused on Early Stuart sockeye migration. Tagging and sonar operations operated from June 27 through August 1. Telemetry stations monitored tagged salmon until the end of August.

All radio tagging occurred in the Matsqui area of the Lower Fraser River. “Trap and transport” operations were not performed in 2023.

Due to potential challenges gathering data, the table below may not definitively reflect fish movement over a particular period.

Date Number of salmon radio tagged below the Big Bar landslide siteFootnote 1 Number of fish 40 km upstream of Big Bar landslide siteFootnote 2
Chinook Sockeye
2023-06-27 1 5 N/A
2023-06-28 1 5 N/A
2023-06-29 3 5 N/A
2023-06-30 4 1 N/A
2023-07-01 6 1 N/A
2023-07-02 4 4 N/A
2023-07-03 5 1 N/A
2023-07-04 4 2 297
2023-07-05 7 2 852
2023-07-06 5 2 1,134
2023-07-07 5 3 1,458
2023-07-08 2 5 1,923
2023-07-09 3 2 1,656
2023-07-10 12 1 1,644
2023-07-11 3 2 2,010
2023-07-12 4 0 2,208
2023-07-13 5 1 1,593
2023-07-14 2 1 1,560
2023-07-15 4 3 1,983
2023-07-16 8 1 2,169
2023-07-17 8 0 2,001
2023-07-18 6 2 2,469
2023-07-19 11 2 2,388
2023-07-20 11 6 3,414
2023-07-21 6 1 3,225
2023-07-22 N/A N/A 3,540
2023-07-23 N/A N/A 3,186
2023-07-24 8 1 3,252
2023-07-25 6 0 3,582
2023-07-26 5 3 3,975
2023-07-27 15 2 4,521
2023-07-28Footnote 4 13 2 5,415
2023-07-29 N/A N/A 4,716
2023-07-30 N/A N/A 4,269
2023-07-31 N/A N/A 5,202
2023-08-01Footnote 3 N/A N/A 2,211
Total 177 66 77,853
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