Author(s): Rohan Benjankar; Daniele Tonina

Linked Author(s):

Keywords: Residual Pool; Habitat; Chinook salmon; Channel topography; Pool area; Velocity and frequency

Abstract: Flow hydraulics differences between pools and other river features (e. g., rifles, runs) contribute to habitat heterogeneity, particularly during low-flow periods. As a result, pool geometry, including size and frequency, may play a crucial role in supporting salmonid habitats. We analyzed habitat characteristics and residual pool dynamics based on channel topography in the Lemhi River and Bear Valley Creek, both located in Idaho, USA. These systems serve as critical habitat for Chinook salmon. Our results indicate that Bear Valley Creek provides superior rearing habitat for juvenile Chinook salmon, with a higher pool frequency (per 1 km of reach), greater pool area, and larger volume. Our findings underscore the importance of pool presence in enhancing aquatic habitat conditions. This information can inform river restoration efforts aimed at improving Chinook salmon habitat.

DOI: https://doi.org/10.64697/978-90-835589-7-4_41WC-P2022-cd

Year: 2025