Dual-frequency identification sonar (DIDSON) was used to estimate adult summer chum salmon Oncorhynchus keta and pink salmon O. gorbuscha passage in the Anvik River from June 16 to July 26, 2024. Apportionment to species was determined using data collected from tower counts. A total of 135,164 (SE 5,726) summer chum salmon and 126,732 (SE 3,032) pink salmon were observed to have passed the sonar site. A high-water event necessitated removing the sonars from the water on July 14. The right bank sonar was redeployed on July 19 and the left bank on July 20. The range of ensonification was considered adequate for most fish that migrated upstream. A beach seine fishery was conducted to collect age, sex, and length information. Because of high water, the fishery was discontinued after July 9. Climate date was collected daily at 1800 and water temperature data was collected hourly.

Climatic and hydrologic data were collected at approximately 1800 each day at the sonar site. River depth was monitored using a staff gauge marked in 1 cm increments. Change in water depth was presented as negative or positive increments from the initial reading of 0 cm. Air temperature and subjective notes about wind speed and direction, cloud cover, and precipitation were also recorded. Water temperature was measured using a HOBO data logger, which electronically recorded the temperature every hour, on the hour, for the duration of the project.