Hollis Reservoir

Hollis reservoir is located approximately 5 miles northwest of Newberg, Oregon and is 1.3 miles upstream of Walker Reservoir.  The reservoir is located on an intermittent drainage ditch near the headwaters of Bryan Creek.  The reservoir stores 75.9 acre-feet of water for the purpose of irrigation, aesthetics, fire prevention, recreation and wildlife.  The dam consists of an earthen embankment that is approximately 600’ long, 250’ wide, and 33’ high.  The depth of the reservoir varies, but is approximately 25’ deep at normal capacity.

Stuntzner staff members and their roll with this project are as follows:

• Bill Flatz & Nick Blundon:  Land Use Planning, Permitting, Engineering, and Construction Administration
• Corey Woodruff & John Hoshall:  Surveying and Construction Staking
• Carol Taylor:  Administrative Assistance

Construction of the reservoir commenced at the end of August and the dam embankment was completed at the end of September, 2016 by Pihl Excavating, Inc.  Approximately 33,000 cubic yards of earthwork was required to construct the earthen embankment, core trench, and emergency overflow spillway.  A time lapse video of the construction of Hollis Reservoir is currently available online at http://www.pihl-inc.com/.  There is wetland mitigation work that is currently being completed by the owner.  Wetland Solutions Northwest, LLC conducted the wetland delineation, wetland permitting, and mitigation plan design.

This reservoir was one of the first reservoirs constructed to the 2015 Oregon Administrative Rules.  The reservoir was permitted through several governing agencies including Yamhill County, the Oregon Water Resources Department, Army Corps of Engineers, the Department of Environmental Quality, the Department of State Lands, and the Oregon Department of Fish and Wildlife.