Assessment of beach-spawning habitat restoration on dissolved oxygen, groundwater upwelling, and egg survival of Lake Ozette Sockeye, OLYM

Primary Investigators

USGS Investigators: Andy Gendaszek , Rich Sheibley

NPS Investigators: Pat Crain

Project Details

Start Year: 2018

Category: Synoptic

2018 2019
$75,000 $75,000
Project Location

NPS Park: Olympic NP

USGS Center: Washington Water Science Center

States: WA

For thousands of years, Lake Ozette, located on the northwest corner of the Olympic Peninsula in Washington State, supported a thriving population of sockeye salmon. However, the population declined precipitously in the latter half of the century, leading to the listing of the population as “threatened” under the Endangered Species Act. Low intragravel dissolved oxygen (DO) in traditional spawning areas, associated with rapid increases of fine sediment along the shoreline and subsequent encroachment by native vegetation, has been identified as a key factor limiting recovery of the population.

In order to address low-dissolved oxygen levels within beach spawning gravels and the geomorphic factors believed to contribute to them, OLYM and other stakeholders are considering shoreline restoration actions. The objective of this study is evaluate the effectiveness of shoreline vegetation management to restore dissolved oxygen conditions in nearshore gravels that are conducive to sockeye salmon spawning success