MEASURING AND MONITORING SPAWNING GRAVEL FOR STEELHEAD TROUT (ONCORHYNCHUS MYKISS) ALONG THE CARMEL RIVER

Destiny-Ciara M. Yano; California State University, Monterey Bay; dyano@csumb.edu; Joab Pimentel, Nikki Gigliotti, Lucas Raymond, James Guilinger

Nearly a decade has passed since the removal of the San Clemente Dam, and the steady flow of sediments from the stockpile continues to travel down the Carmel River. This ongoing sediment transport has significant implications for the river ecosystem, particularly for the steelhead trout, an endangered species whose habitats lie downstream. Steelhead trout are known to migrate upstream after the winter months to lay their eggs in designated spawning grounds. These spawning grounds require specific conditions: coarse gravel and fast-flowing water. By measuring and monitoring the size of the spawning gravel using a gravelometer through cross-sections of the river, we can assess the health and suitability of these habitats over time. The data collected from these measurements is crucial for conservation efforts. If there is a notable accumulation of fine sediments burying the spawning gravel, this information can be presented to conservation agencies that protect and restore critical aquatic ecosystems. This study is particularly valuable for its focus on the long-term effects of low-impact dam removal projects.

Poster Session