Marshall Barrows

Fish Biologist Marshall Barrows
Fish Biologist - Natural Population Assessment
Address

1211 SE Cardinal Court Suite 100
Vancouver, WA 98683
United States

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About Marshall Barrows

Marshall leads our office’s monitoring and evaluation efforts for the Clackamas River Bull Trout Reintroduction Project. He is responsible for developing study plans, designing sampling protocols, coordinating and implementing sampling efforts, producing annual reports and presenting our findings to stakeholders. Marshall leads an effort to evaluate a non-native Brook Trout population in a tributary to the Walla Walla River and assess the threat it poses to resident ESA-listed Bull Trout populations. In addition, he contributes his expertise to Bull Trout workgroups in the Walla Walla and Clackamas River Basins.

Program: Natural Population Assessment

Current Projects:

1. Monitoring and assessing the recently-established Bull Trout population in Pinhead Creek as part of the Clackamas River Bull Trout Reintroduction Project in the Willamette Basin

2. Monitoring and assessing the Bull Trout spawning populations in the North Fork Lewis River in the Lewis River Basin

Past Projects: 

1. Monitored and assessed migratory Bull Trout movement patterns, distribution, connectivity and habitat use in the Walla Walla River sub-basin

2. Monitored Bull Trout populations of the Mainstem Columbia and Snake rivers.

3. Examined factors limiting Columbia River Gorge Chum Salmon populations downstream of Bonneville Dam.

4. Analyzed Steelhead spawning ground substrate on seven tributaries to the Wind River in the Gifford Pinchot National Forest near Carson, WA. (US Forest Service).

5. Monitored out-migrant Pacific salmonid smolts on the Snake River and Columbia River. (Army Corps of Engineers).

6. Restored drained wetlands for the Chase Lake Prairie Project 

Background:

Before coming to the CRFWCO, Marshall worked for the US Forest Service, US Army Corps of Engineers and the US Fish and Wildlife Service at Chase Lake National Wildlife Refuge.

At CRFWCO Since: 2000

From The Library

Estimating the Abundance of Adfluvial Bull Trout Spawning in Cougar Creek

In response to a general decline in abundance across their native range, Bull Trout (Salvelinus confluentus) were listed as threatened under the Endangered Species Act in 1999. Gaining a better understanding of the reproductive component of a population is important for Bull Trout recovery and...

Clackamas River Bull Trout Reintroduction Project 2022 Annual Report

Bull Trout (Salvelinus confluentus) were last documented in the Clackamas River in 1963. Over four decades later, a 2007 feasibility study determined the Clackamas River Subbasin to be a promising candidate for Bull Trout reintroduction. In 2011, the first phase of a multi-agency reintroduction...

Brook Trout Distribution in the Spring Branch Tributaries of the East Little Walla Walla River 2011 Assessment Report

Invasive, self-sustaining populations of Brook Trout (Salvelinus fontinalis) have become established in basins throughout the Pacific Northwest where they may displace and compete with native salmonids (Dunham et al. 2002; Meyer et al. 2006). The Bull Trout Draft Recovery Plan (USFWS 2002)...

2016-2019 Report_Brook Trout in the Walla Walla River Basin - Assessing the Conservation Risks to Bull Trout

The presence of self-sustaining populations of nonnative Brook Trout (Salvelinus fontinalis) in stream systems can potentially threaten the long-term persistence of Bull Trout (Salvelinus confluentus). A crucial component of the Bull Trout Recovery Plan involves identifying potential threats and...

Estimating the Abundance of Adfluvial Bull Trout Spawning in Cougar Creek

In response to a general decline in abundance across their native range, Bull Trout (Salvelinus confluentus) were listed as threatened under the Endangered Species Act in 1999. Gaining a better understanding of the reproductive component of a population is important for Bull Trout recovery and...