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Adam Stonewall

Adam Stonewall is a supervisory hydrologist and the surface water specialist at the USGS Oregon Water Science Center.

I have been a Hydrologist in the Oregon Water Science Center since 2001. My background is primarily in flood frequency analysis.  I also have strong interest and/or experience in statistical testing for nonstationarity, climate change, monte-carlo simulations and nonparametric statistics.

Education and Certifications

  • B.S. in hydrology from the University of Arizona

  • M.S. in forest hydrology from the University of British Columbia. Thesis: “The Use of Monte-Carlo Simulations in the Detection of Nonstationarity in Peak-Annual Flood Time Series of British Columbia"

Science and Products

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highway

Effects of Highway Runoff on Water Quality

"SELDM facilitates analysis by providing precipitation, pre-storm streamflow, and other variables by region or from hydrologically similar sites."
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Oregon Water Science Center
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Effects of Highway Runoff on Water Quality

"SELDM facilitates analysis by providing precipitation, pre-storm streamflow, and other variables by region or from hydrologically similar sites."
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Crystal Springs Creek

Johnson Creek Basin Hydrologic Monitoring Study

The USGS provides hydrologic data for the Johnson Creek Basin. Real-time surface-water, water-quality and groundwater data, as well as historic data and analyses, help to improve our understanding of the hydrology of the basin.
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Oregon Water Science Center
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Johnson Creek Basin Hydrologic Monitoring Study

The USGS provides hydrologic data for the Johnson Creek Basin. Real-time surface-water, water-quality and groundwater data, as well as historic data and analyses, help to improve our understanding of the hydrology of the basin.
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Stochastic Empirical Loading and Dilution Model (SELDM) model archive and instructions for the Siskiyou Pass, Oregon

Chloride deicers have been applied by the Oregon Department of Transportation (ODOT) to Interstate-5 (I-5) from the Oregon-California border north to mile marker 10 for several years in the high-elevation area known as the Siskiyou Pass. Magnesium chloride (MgCl2) and sodium chloride (NaCl) are applied to keep the interstate safe for drivers and allow for efficient transport of goods and people th
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Oregon Water Science Center

Oregon SELDM tools

A series of tools (spreadsheets, a database and a document) to be used in conjunction with the SELDM simulations used in the publication: Stonewall, A.J., and Granato, G.E., 2019, Assessing potential effects of highway and urban runoff on receiving streams in total maximum daily load watersheds in Oregon using the Stochastic Empirical Loading and Dilution Model: U.S. Geological Survey Scientific I
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Oregon Water Science Center

Highway-Runoff Database (HRDB) Version 1.0.0b

The Highway-Runoff Database (HRDB) was developed by the U.S. Geological Survey (USGS), in cooperation with the Federal Highway Administration (FHWA) to provide planning-level information for decision makers, planners, and highway engineers to assess and mitigate possible adverse effects of highway runoff on the Nation's receiving waters. The HRDB was assembled by using a Microsoft Access database
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New England Water Science Center

Flood inundation mapping data for Johnson Creek near Sycamore, Oregon

The basis for these features is U.S. Geological Survey Scientific Investigations Report 2017-5024 Flood Inundation Mapping Data for Johnson Creek near Sycamore, Oregon. The domain of the HEC-RAS hydraulic model is a 12.9-mile reach of Johnson Creek from just upstream of SE 174th Avenue in Portland, Oregon, to its confluence with the Willamette River. Some of the hydraulics used in the model were t
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Oregon Water Science Center
Filter Total Items: 19

Assessing the effects of chloride deicer applications on groundwater near the Siskiyou Pass, southwestern Oregon, July 2018–February 2021

The U.S. Geological Survey, in cooperation with the Oregon Department of Transportation (ODOT), evaluated the effects of cold-weather chloride deicers (road deicing chemicals) on groundwater quality, with a focus on chloride, near the Siskiyou Pass in southwestern Oregon. The study covered the period during July 2018 through February 2021. Between the years 2016 and 2020 ODOT applied up to 16,000
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Stephen B. Gingerich, Daniel R. Wise, Adam J. Stonewall
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Water Resources Mission Area, Oregon Water Science Center

Assessing the impact of chloride deicer application in the Siskiyou Pass, southern Oregon

Chloride deicers have been applied by the Oregon Department of Transportation (ODOT) to Interstate Route 5 (I–5) from the Oregon-California border north to mile marker 10 for several years in the high-elevation area known as the Siskiyou Pass. Magnesium chloride (MgCl2) and sodium chloride (NaCl) are applied to keep the interstate highway safe for drivers and allow for efficient transport of goods
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Adam J. Stonewall, Matthew C. Yates, Gregory E. Granato
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Water Resources Mission Area, New England Water Science Center, Oregon Water Science Center

Historical streamflow and stage data compilation for the Lower Columbia River, Pacific Northwest

The U.S. Geological Survey mined data from a variety of national and state agencies including USGS, Oregon Water Resources Department, National Oceanic and Atmospheric Administration, Washington Department of Ecology, Pacific Northwest National Laboratory, Portland State University, and U.S. Army Corps of Engineers. A comprehensive dataset of streamflow, stage, and tidal elevations for the Lower C
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Carrie L. Boudreau, Marc A. Stewart, Adam J. Stonewall
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Water Resources Mission Area, Oregon Water Science Center

Development of regional skew coefficients for selected flood durations in the Columbia River Basin, northwestern United States and British Columbia, Canada

Flood-frequency (hereinafter frequency) estimates provide information used to design, operate, and maintain hydraulic structures such as bridges and dams. Failures of these structures could cause catastrophic loss of property, life, or both. In addition to frequency estimates that use annual peak streamflow, frequency estimates of flood durations are required to safely and effectively operate the
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Greg D. Lind, Jonathan R. Lamontagne, Adam J. Stonewall
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Water Resources Mission Area, Oregon Water Science Center

Evaluation of restoration alternatives using hydraulic models of lake outflow at Wapato Lake National Wildlife Refuge, northwestern Oregon

Wapato Lake National Wildlife Refuge near the city of Gaston in northwestern Oregon was established in 2013, and planning is underway to restore a more natural lake and wetland system after more than 100 years of agricultural activity on the lakebed. Several water-management and restoration alternatives are under consideration, one of which involves opening and reconnecting Wapato Lake’s outlet to
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Stewart A. Rounds, Stephen L. Pilson, Annett B. Sullivan, Adam J. Stonewall
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Water Resources Mission Area, Oregon Water Science Center

Assessing potential effects of highway and urban runoff on receiving streams in total maximum daily load watersheds in Oregon using the stochastic empirical loading and dilution model

The Stochastic Empirical Loading and Dilution Model (SELDM) was developed by the U.S. Geological Survey (USGS) in cooperation with the Federal Highway Administration to simulate stormwater quality. To assess the effects of runoff, SELDM uses a stochastic mass-balance approach to estimate combinations of pre-storm streamflow, stormflow, highway runoff, event mean concentrations (EMCs) and stormwate
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Adam J. Stonewall, Gregory E. Granato, Kira M. Glover-Cutter
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Water Resources Mission Area, Oregon Water Science Center, New England Water Science Center

Assessing roadway contributions to stormwater flows, concentrations, and loads with the StreamStats application

The Oregon Department of Transportation (ODOT) and other state departments of transportation need quantitative information about the percentages of different land cover categories above any given stream crossing in the state to assess and address roadway contributions to water-quality impairments and resulting total maximum daily loads. The U.S. Geological Survey, in cooperation with ODOT and the
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Adam Stonewall, Gregory E. Granato, Tana Haluska
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Water Resources Mission Area, Oregon Water Science Center

Preliminary flood-duration frequency estimates using naturalized streamflow records for the Willamette River Basin, Oregon

In this study, “naturalized” daily streamflow records, created by the U.S. Army Corps of Engineers and the Bureau of Reclamation, were used to compute 1-, 3-, 7-, 10-, 15-, 30-, and 60-day annual maximum streamflow durations, which are running averages of daily streamflow for the number of days in each duration. Once the annual maximum durations were computed, the floodduration frequencies could b
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Greg D. Lind, Adam J. Stonewall
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Water Resources Mission Area, Oregon Water Science Center

Hydrogeologic framework and selected components of the groundwater budget for the upper Umatilla River Basin, Oregon

Executive SummaryThis report presents a summary of the hydrogeology of the upper Umatilla River Basin, Oregon, based on characterization of the hydrogeologic framework, horizontal and vertical directions of groundwater flow, trends in groundwater levels, and components of the groundwater budget. The conceptual model of the groundwater flow system integrates available data and information on the gr
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Nora B. Herrera, Kate Ely, Smita Mehta, Adam J. Stonewall, John C. Risley, Stephen R. Hinkle, Terrence D. Conlon
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Water Resources Mission Area, Oregon Water Science Center

Developing flood-inundation maps for Johnson Creek, Portland, Oregon

Digital flood-inundation maps were created for a 12.9‑mile reach of Johnson Creek by the U.S. Geological Survey (USGS). The flood-inundation maps depict estimates of water depth and areal extent of flooding from the mouth of Johnson Creek to just upstream of Southeast 174th Avenue in Portland, Oregon. Each flood-inundation map is based on a specific water level and associated streamflow at the USG
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Adam J. Stonewall, Benjamin A. Beal
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Water Resources Mission Area, Oregon Water Science Center

Evaluation of flood inundation in Crystal Springs Creek, Portland, Oregon

Efforts to improve fish passage have resulted in the replacement of six culverts in Crystal Springs Creek in Portland, Oregon. Two more culverts are scheduled to be replaced at Glenwood Street and Bybee Boulevard (Glenwood/Bybee project) in 2016. Recently acquired data have allowed for a more comprehensive understanding of the hydrology of the creek and the topography of the watershed. To evaluate
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Adam Stonewall, Glen Hess
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Water Resources Mission Area, Oregon Water Science Center

Development of a CE-QUAL-W2 temperature model for Crystal Springs Lake, Portland, Oregon

During summer 2014, lake level, streamflow, and water temperature in and around Crystal Springs Lake in Portland, Oregon, were measured by the U.S. Geological Survey and the City of Portland Bureau of Environmental Services to better understand the effect of the lake on Crystal Springs Creek and Johnson Creek downstream. Johnson Creek is listed as an impaired water body for temperature by the Oreg
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Norman L. Buccola, Adam J. Stonewall
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Water Resources Mission Area, Oregon Water Science Center
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New Publication - Assessing the Effects of Chloride Deicer Applications on Groundwater near the Siskiyou Pass, Southwestern Oregon

The U.S. Geological Survey, in cooperation with the Oregon Department of Transportation, evaluated the effects of cold-weather chloride deicers (road...

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