Mark Yinger Associates performs groundwater resource studies on local and regional  scales.


     Water source development and water source protection are often the focus of groundwater studies.  Drinking water for communities, wells for irrigators, and maintaining water quanity and quality for optimal stream habitats are the diverse goals of these projects.  

 Representative Water Resource Projects...

  • Harney Basin Groundwater Study, Oregon

        Mark Yinger Associates / Aquaveo Team for Harney Basin Watershed Council

The Harney Basin Groundwater Study was performed to better understand the groundwater characteristics of the Harney Basin in central Oregon.  Mark Yinger Associates described the geology, hydrogeology and hydrology of the Harney Basin's aquifers.  Existing groundwater use and water quality data will be organized and compiled to provide a basis for developing groundwater  management policy.  A preliminary water budget, based on the available data, will be made.  A complete 3D hydrogeologic model was created using Aquaveo's Groundwater Modeling system.

  • Groundwater Source Investigation -- Bickleton, Washington

Water produced by private and public wells in the community of Bickleton has nitrate concentrations that greatly exceed safe drinking water standards.  This project involved investigating the extent of the nitrate impact and defining a target aquifer for a new community water system well that would be free of the nitrate impact.  Several sites for new wells were identified. 

  •  Water System Improvements -- City of Mosier, Oregon

Mark Yinger was a sub-consultant to Berger/ABAM Engineering.  The first phase of the project involved identifying, evaluating, and ranking all potential groundwater resources culminating in a recommendation of a site for a new production well.  Phase two involved developing specifications for a new well and for the repair of commingling Well #3.  The new well construction involved inspection of drilling, construction, and testing of the new well.   

  • Crooked River Environmental Flows Report--Oregon

Mark Yinger was a member of WPM, Inc. team of scientists which made an assessment of Crooked River flow conditions below Bowman Dam.  The assessment product was recommendations for environmentally sustainable river flows.  The study area includes the City of Prineville, Oregon.  Mark Yinger was responsible for evaluating historical and current groundwater / surface interactions.  This project included a comprehensive compilation and review of the pertinent literature and data.

  • Crystal Springs Zone of Contribution Definition -- Upper Hood River Valley, Oregon

This study defined the boundary of the recharge area for Crystal Springs.  Crystal Springs supplies drinking water for a major portion of Hood River County, Oregon.  The study involved detailed hydrogeologic mapping in a setting of complex volcanic geology, stream flow measurements and a water balance.  The boundary was certified by the Oregon Department of Human Services and Health establishing a source water protection area. 

  • Skamania County Public Utility District #1, Carson Water System -- Carson, Washington

The objective was exploration for a new groundwater source that would eventually replace the current diversion of Bear Creek water for the Carson Water System.  The project involved hydrogeologic mapping, conceptual modeling, and geophysical surveys to define locations for two test wells.  Neither well encountered productive enough aquifers.  Based on these results the district proceeded to test an existing well and eventually acquired the well and constructed a new water transmission line.  Mark Yinger Associates worked as a sub-consultant to Wallis Engineering.

Mark Yinger is currently assisting the PUD with Phase I evaluation of two water right applications.  This work involves the defining the source water body which includes the source aquifer and connected surface waters.  The work involved identifying all senior water right applications in the defined source water body. 


  • National Golf Courses Inc./Multnomah County Drainage District No.1 -- Portland, Oregon


Mark Yinger assisted National Golf Courses Inc. with a change in point of diversion for a golf course irrigation water right.  The change was from a diversion on the Columbia Slough, a tributary of the Columbia River, to a new well.  The work involved a review of the area hydrogeology, area well logs, production well specifications, and a pumping test. 

  • Skamania County Public Utility District #1, Underwood Water District -- Underwood,  Washington

Mark Yinger conducted a study to define a location for a new production well needed to augment water supply during periods of low flow from Shaddock Spring.  A well was designed, installed and tested.  A hydrogeologic assessment supported the use of the new well as an alternate point of diversion for water rights associated with the spring.  The geologic setting can be characterized as Quaternary basaltic lavas and cinders filling a deep canyon eroded in Grande Ronde Basalt.

  • Wind/White Salmon Watershed Assessment, WRIA 29 --Washington

A comprehensive Level I description and assessment of the hydrogeology and groundwater resources of the WRIA 29 region was performed.  This region includes the Wind River, Little White Salmon River and White Salmon River drainage basins.  Additional Level II assessment work involved a study of the lower Wind River basin and a groundwater monitoring plan for the entire WRIA-29 region.

  • Potable Springs Characterization for City of Hood River -- Oregon

This study defined the geologic features controlling the occurrence of several large springs (13 million gallons per day) to guide redevelopment intended to improve spring water capture and sanitary protection.  This extensive study involved:  detailed hydrogeologic mapping, seismic refraction surveys, self potential surveys, VLF surveys, stream channel and spring flow measurements, and tracer testing.

A buried channel was identified beneath an andesite talus slope approximately 300 feet up gradient of the current spring water collectors.  The self-potential survey and tracer testing confirmed water flow in the channel and its connection to the springs.  A conceptual hydrogeologic model was developed to define the zone of contribution for the springs.

  • Critical Aquifer Recharge Area Definition for City of White Salmon -- Washington 

This study involved hydrogeologic mapping in the City of White Salmon's Buck Creek Watershed area.  The objective was to define recharge areas for aquifers contributing to the drainage basin's base-flow.  The study established that a significant portion of the recharge area is located outside the topographic watershed boundary.  The boundary of the newly defined recharge area was used to negotiate with the U.S. Forest Service new land use zoning for long term water quality and quantity protection.

  • Groundwater Resource Portion of Comprehensive Plan for City of White Salmon -- Washington

This regional study was conducted to inventory and rank potential groundwater sources for future development.  The City had relied on a watershed that at times failed to provide adequate quality water.  This study identified and ranked four potential aquifers for development. 

  • Irrigation Well for Limmeroth Ranches, Eightmile Creek Drainage --  The Dalles, Oregon

This project involved a hydrogeologic investigation for the purpose of selecting the location for a new irrigation well.  A fault was identified and mapped that offsets very permeable zones within the Columbia River Basalts resulting in a much greater hydraulic head up gradient of the fault.  Mark Yinger sited the new well to take advantage of his findings.  A long term pumping test of the well was performed and the new well proved very productive.

  • Drinking Water Wells for City of White Salmon -- Washington 

This project involved the selection of locations for two production wells and two observation wells for the City of White Salmon, Washington.  The work included well design, bid specifications and construction monitoring.  The combined production rate of these new wells is approximately 2,400 gallons per minute.  The project also included long term pumping tests, groundwater/surface water interaction and well interference studies, and technical support for water right changes.  Finally, wellhead protection zones were defined for the production wells.  

  • Aquifer Test and Wellhead Protection for Fordyce Springs Incorporated -- Washington

This project involved the management of a long term pumping test of a new potable water well for a new rural public water system in Washington State.  Drawdown at three existing domestic wells and the flow from one spring were monitored during the pumping.  The drawdown and recovery at the pumping well was monitored using a pressure transducers and data logging equipment.  This information was analyzed to determine the transmissivity of the aquifer.  The analysis of time-drawdown data for the pumped well and  the observed small decline of water levels in the domestic wells indicated that the deeper aquifer is a semi-confined leaky aquifer.  The wellhead protection area was delineated.

  • City of Mosier Drinking Water Well --Oregon

Mark Yinger conducted a study to evaluate well capacity, interference, and commingling of artesian aquifers within the Wanapum Basalt.

  • Geothermal Wells for Bonneville Hot Springs Resort, Washington 

This project involved hydrogeologic mapping, conceptual hydrogeologic modeling, and seismic surveys to select locations for geothermal wells.

  • Monitoring well network for OSU Agricultural Extension Services & USDA --La Grande, Oregon 

This project involved specifying well locations and construction for two monitoring well networks situated along the Grande Ronde River.  The monitoring wells are to be used to evaluate the long term impact of experimental agricultural practices on groundwater quality.

  • Evaluation of Impacts to Area Water Wells from Condit Dam Decommissioning-- Washington

This is a current project for PacifiCorp and their consultant Kleinfelder.  Condit Dam on the White Salmon River was removed in October 2011.  Northwestern Lake formed by the dam was drained. This evaluation of impacts to area water wells involves monitoring groundwater level declines in response to the draining of Northwestern Lake, and using the data to project the trend of the groundwater decline.