Julie Harris

Julie Harris, Biometrician at CRFWCO, holding a juvenile Pacific Lamprey in the palm of her hand while wearing a black hoodie. Julie is standing next to bushes in a natural setting
Aquatic Statistician - Natural Population Assessment, Passage and Habitat Assessment

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

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About Julie Harris

Julie’s main responsibilities are to conduct and support study design, data analysis, demographic modeling, and writing for studies completed at CRFWCO to support conservation and management of fish, fisheries, and aquatic habitats in the Columbia River Basin. Julie also provides statistical support to other fisheries professionals and to the National Wildlife Refuges Program. Julie is involved in information exchange and conservation of Pacific Lamprey. In addition, Julie is the coordinator of the CRFWCO monthly seminar series.

Program: Natural Population Assessment   Passage and Habitat Assessment

Current Projects:

1. Examining patterns in Pacific Lamprey occupancy and abundance in the Columbia River Basin

2. Estimating vital rates to help assess the feasibility of stocking YY Males to eradicate Brook Trout from an isolated Washington stream

3. Identifying trends in abundance and distribution of birds in the Fitzner-Eberhardt Arid Lands Ecology Reserve on the Hanford Reach National Monument.

Past Projects: 

1. Harris, J.E., J.J. Skalicky, T.L. Liedtke, L.K. Weiland, B.J. Clemens, and A.E. Gray. 2020. Effects of dewatering on behavior, distribution, and abundance of larval lampreys. River Research and Applications 36:2001-2012.

2. Harris, J.E. 2020. Assessing accuracy and bias of protocols to estimate age of Pacific salmon using scales. North American Journal of Fisheries Management 40:1007-1022. 

3. Clemens, B.J., L. Weitkamp, K. Siwicke, J. Wade, J. Harris, J. Hess, L. Porter, K. Parker, T.M. Sutton, and A.M. Orlov. 2019. Marine biology of the Pacific lamprey Entosphenus tridentatus. Reviews in Fish Biology and Fisheries 29:767-788.

4. Harris, J.E., C. Newlon, P.J. Howell, R.C. Koch, and S.L. Haeseker. 2018. Modeling individual variability in growth of bull trout in the Walla Walla River Basin using a hierarchical von Bertalanffy growth model. Ecology of Freshwater Fish 27(1):103-115.

5. Harris, J.E., and J.C. Jolley. 2017. Estimation of occupancy, density, and abundance of larval lampreys in tributary river mouths upstream of dams on the Columbia River, Washington and Oregon. Canadian Journal of Fisheries and Aquatic Sciences74(6):843-852. 

6. Hightower, J.E., and J.E. Harris. 2017. Estimating fish mortality rates using telemetry and multistate models. Fisheries 42(4):210-219.

At CRFWCO since: 2013

Additional roles
Co-organizer for the annual Lamprey Technical Information Exchange
Coordinating and executing the CRFWCO monthly seminar series
Associate Editor for the American Fisheries Society Marine and Coastal Fisheries Journal
Areas of expertise
Study Design
Data Analysis

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...

Aquatic Invasive Species Monitoring at Lower Columbia River Basin National Fish Hatcheries using eDNA and Visual Surveys

National Fish Hatcheries (NFHs) produce fish that provide commercial and recreational fishing opportunities, fulfil tribal trust and mitigation responsibilities and contribute to the recovery of threatened and endangered species. Managing the threat of aquatic invasive species (AIS) is one of...

Feasibility Assessment of Stocking YY Males to Eradicate Nonnative Brook Trout from Tyee Springs

An established population of nonnative Brook Trout resides in Tyee Springs directly upstream from Carson National Fish Hatchery. The potential for Brook Trout to escape from Tyee Springs and enter the hatchery is a concern because the hatchery releases spring Chinook yearlings into the Wind...

Monitoring of Native Fish in Tryon Creek City of Portland FY 2012-2019 Final Report

Tryon Creek is a relatively undisturbed urban watershed located in southwest Portland, Oregon. The habitat is well suited for native fish; however, the lower portion of the stream is bisected by a culvert that runs under Oregon State Highway 43. To improve habitat and passage conditions for...

Clackamas River Bull Trout Reintroduction Project 2016 Annual Report

The last bull trout Salvelinus confluentus documented in the Clackamas River was in 1963. Over 40 years later, a 2007 feasibility study suggested the Clackamas River Subbasin could support bull trout and would be a good reintroduction candidate. A reintroduction effort was first implemented in...