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August 13, 2019 at 5:15 p.m.


Tigard Public Works Building
Public Works Auditorium
8777 SW Burnham St.
Tigard, OR 97223

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The City of Sherwood supplies water to our customers by way of four City-owned ground water wells and the purchase of water from the City of Portland water system through an Intergovernmental agreement with City of Tualatin and Tualatin Valley Water District (TVWD). The actual connection point to obtain City of Portland source water is from the City of Tualatin transmission pipeline located in Tualatin. It is necessary to purchase this additional water for Sherwood to meet customer water demands during peak months.

The blending of the city ground water wells and water supply from the City of Portland Bull Run watershed/Columbia South Shore Well Field depends upon the time of year. During the summer months our high demand periods can approach 5 million gallons per day, of which 3 million gallons of water is from the Portland source and the remaining 2 million comes from city wells. In order to maintain water quality in the 4 mile 24” transmission pipeline, a minimum percentage of water is always being used from the Portland water source.

In 2005, the City adopted a Water Master Plan which details anticipated water needs for the City of Sherwood. Identified within the Master Plan were options for long-term water source needs. After Council reviewed the options, they directed staff to present a ballot to the voters to consider the Willamette River as a source for the City.

In January 2006, the City of Sherwood began working on a feasibility study of the pipeline route. This allowed the City to determine the best pipe route option and helped to decide by August 2006 that it was cost-effective to proceed.The study indicated that we needed to partner with the City of Wilsonville on Segments 2, 3, 4 and 5 to reduce costs to our citizens since these segments had already been constructed or were in the process of being constructed.

In 2006 the City entered into an Intergovernmental Agreement (IGA) with Tualatin Valley Water District (TVWD) to acquire an undivided ownership interest in a portion of TVWD’s ownership interest in the Water Treatment Plant (WTP) facilities in Wilsonville, Oregon. We purchased 5.0 million gallons per day (mgd) capacity of undivided interest and have plans to purchase an additional 15.0 mgd in the near future.

In 2007 the City entered into an IGA with the City of Wilsonville for Segment 2 water line. Also in 2007 the City entered into a contract with Murray, Smith and Associates (MSA) for design and construction management of the water supply improvement project.

In 2008 the City entered into an IGA with the City of Wilsonville for Segments 4 and 5 of the water line. The City entered into a contract with Emery and Sons to construct the 4.0 Million Gallon Reservoir, with Tennis Courts, Half Street Improvement on Division Street, Pump Station and 1,300 ft of 48” water transmission pipeline. This project was completed in December 2009.

Also in 2008 the City entered into an intergovernmental cooperative agreement that allocated 20.0 mgd to the City of Sherwood through the Willamette River Water Coalition (WRWC).

In June 2009 the City entered into a contract with Emery and Sons to install 18,000 lf of 48” transmission pipeline between Sherwood and Wilsonville. Taking advantage of the low cost of steel during this period, the contractors’ bids came in at around half the cost of the engineer’s estimate. This project is expected to be completed summer of 2011. The contractor has until December 2011 but is ahead of schedule.

Sherwood/Wilsonville Pipeline Installation

sher-1 sher-2 sher-4 sher-5 sher-6 sher-7

Click on any photo to launch the gallery

Progress continues in 2010 starting with a partnership with Wilsonville to construct a meter vault, which will tie segments 5 and 6 together. Bidding for the meter vault will occur early 2011 with construction occurring spring 2011. Segment 3 shares a similar partnership with the City of Wilsonville and currently is in the design and permitting process. Permits should be issued around fall 2011 with construction following. Once constructed, this will allow Sherwood 5 mgd.

In 2010 the City is currently working on an interim water supply that would allow Sherwood to take up to 2.5 mgd from the Wilsonville Water Treatment Plant. This could happen once the vault is constructed.

Related Links:
City of Sherwood at www.ci.sherwood.or.us
Tualatin Valley Water District at www.tvwd.org
City of Sherwood's 2010 Annual Water Report
City of Sherwood's 2009 Annual Water Report
Willamette River Fish - Information about threatened fish, flow targets, and water conservation

Sherwood poised to take water from Willamette River for future needs, The Oregonian,
Thursday, January 20, 2011

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