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9611 SE 36th Street
Mercer Island, WA 98040
Phone: 206.275.7600
Fax: 206.276.7663
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Water System 2015 Improvement Projects

Water Pipe Trench Example
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Project Status

  • Sept 2015 Update: All work is complete at this time. While the road patches are not perfect, drivers will witness a full asphalt overlay of Island Crest Way in this area, scheduled for Summer 2016.
  • Island Crest Way work updates: NOTE - ICW will always have at least 1 lane in each direction during construction periods (dates are subject to change)
  • Aug 24: This week, permanent asphalt patches will be added to Island Crest Way (btw SE 40th and SE 44th Streets), and on 93rd Ave SE south of SE 72nd Street. After trench patching, crews will begin clean up and final property/landscape restoration.
  • Aug 17: This week the largest remaining connection to the new water main was completed, and most Island Crest Way water-related work is now done.
  • July 20-24: Brief return to 90th Ave SE and 93rd Ave SE to finish connections, patch streets
  • July 13-Early Sept: Finish planned ICW work, and add additional unplanned 850ft of water main between SE 42nd and SE 44th streets, due to access problems with current piping. Temporary road patches will be replaced with permanent asphalt patches in September.
  • July 10: Approx 90% of new water main (and house connections) now complete
  • June 23-July 3: work from SE 44th street heading north on house connection
  • June 22 (approx): work at SE 40th Street intersection
  • June 15-19: work from SE 42nd north on ICW to SE 40th Street
  • June 10-12: work on ICW between SE 43rd and SE 44th Streets
  • June 9: exploratory excavation holes in ICW, starting at SE 40th, south to SE 44th Street
  • May 28 - Most of the work at SE 44th St and 85th Ave SE has been completed, except for restoration measures such as trench patching, landscaping, and permanent abandonment of the old system. Since early May, work at 89th and 90th Ave SE has been underway, including water mains, side connections, and fire hydrants, with final restoration and switch-over expected by June 2. On May 22, excavation began along 93rd Ave SE through mid-June.
  • April 9 - This week (April 6-10), the contractor (Earthwork) has been installing new water main along 85th Ave SE, starting from SE 42nd Street and working north; this is expected to take until the end of April.     
    April 3 - Construction started on March 24, 2015 around SE 44th Street, from Island Crest Way to 86th Ave SE; as of April 3, new water main and the majority of the residential connections for this area have been installed.  Note that a water main shutdown is scheduled for April 15 for the contractor to make the water main connections at the intersection of SE 44th St and 86th Ave SE. After this time, the contractor will begin to switch over residential water connections along SE 44th Street, from the existing water main to the new water main.
  • March 20 - Pending final review of submittal materials and Right-of-Way permits, construction is expected to begin the week of March 23, 2015. The first work area will be SE 44th Street between Island Crest Way and 86th Ave SE (see map) involving excavation and pipe laying. This portion is expected to last two weeks and traffic control will be provided as necessary. Connections to individual houses may be replaced then, or a later date, to be determined.
  • February 26 - A public open house was held on February 26, from 5:00-6:00pm at City Hall.
  • February 4 - The City determined that Earthwork Enterprises from Mukilteo, Washington submitted the lowest of six bids; the construction contract will be awarded at the February 23 Council Meeting.

Project Details

Neighborhood: Various

Work Locations:
  • Island Crest Way from SE 44th/Merrimount Drive to SE 40th Street
  • SE 44th Street from Island Crest Way to 86th Ave SE
  • 85th Avenue SE from SE 42nd to SE 40th Street
  • 89th Avenue SE and 90th Avenue SE from SE 41st Street to SE 40th Street
  • 93rd Avenue SE south of SE 72nd Street
View a Vicinity Map here.

Project Type: Water

Description: The City is preparing to start the construction of its 2015 Water System Capital Improvement Project in March 2015, consisting of the replacement and installation of 5,480 feet of water mains, 107 water services, 17 fire hydrants, other water system components, and related surface restorations.

Project Timeline: Construction is anticipated to start in mid or late March 2015 and is estimated to take 120 working days to progress through all work areas, with projected completion in September 2015.

Information regarding the dates for impacts to each specific work area will become available in several weeks, and will be published via various City outreach channels, the City website, and the MI Weekly E-newsletter.

Estimated Budget: $2.4 million for all locations - this includes survey, design and construction costs.

Project Status: To help keep area residents informed of our construction progress, we will post project updates to this site on a regular basis. (See top of page)

Impact to Residents: On Island Crest Way, the work area is limited to the two northbound lanes, but during construction traffic flow will be impacted significantly.  Except for the Island Crest Way portion, all other work areas are within residential neighborhoods and should have minor impacts.
Affected residents adjacent to project areas are receiving a letter from the City of Mercer Island.
If shutoffs are necessary, we will also hang a reminder notice on your front door the day before water shutdowns and street closures.
Important: Notify the City now if you have special landscape plants, irrigation lines or invisible fencing, particularly if they are located near the meter box. Also, keep everyone safe by keeping kids and pets away from the construction zones.

Want to learn more?  You may find our list of Frequently Asked Questions to be helpful.
Contact:  Rona Lin, P.E., City of Mercer Island Utilities Engineer: (206) 275-7806 or
Background: The City of Mercer Island evaluates our water system on a regular basis to ensure that the infrastructure remains in good condition and maintains adequate capacity to provide water to customers.  The water mains in this area need upgrading to provide adequate fire flow to hydrants.




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