Conveyance and Condition Assessment

Project Status

To help keep area residents informed of our construction progress, we will post project updates to this site on a regular basis. Click here to see status updates.

Project Description 

The stormwater conveyance system includes a network of pipes (mains and laterals), culverts, ditches, and outfalls.   The goal of this project is to inspect the mains including verifying pipe diameter, material, and condition.  Inspections will be performed using closed circuit television (CCTV) cameras inserted into the pipes.

CCTV is a common method of inspecting and assessing the condition of pipes.  A remote-controlled crawler mounted camera moves along the inside of pipes to provide an image for assessment.  The CCTV results will be used to evaluate the overall stormwater pipeline condition to identify and prioritize system improvement needs.

Project Location

The inspection locations include:

• Location 1 - Basin 1, 12" - 18" diameter stormwater pipe running north/south along East Mercer Way from 100^th Ave SE to SE 38^th St
• Location 2 - Basin 3b, 42" diameter stormwater pipe along SE 35^th St in Aubrey Davis Park
• Location 3 - Basin 6, 12" - 18" diameter stormwater pipe in multiple locations including 84^th Ave SE, 88^th Ave SE, Mercer Island High School, and 90^th Ave SE. Some of these stormwater pipes are in residential yards by easement.
• Location 4 - Basin 7, 12" - 18" diameter stormwater pipe in multiple locations including 84^th Ave SE, SE 28^th St, and 81^st Pl SE
• Location 5 - Basin 11, 12" - 36" diameter stormwater pipe along North Mercer Way and SE 24^th St
• Location 6 - Basin 14, 15" - 18" diameter stormwater pipe in multiple locations along SE 24^th St, 71^st Ave SE, and 72^nd Ave SE
• Location 7 - Basin 19b, 12" - 18" diameter stormwater pipe in multiple locations along 69^th Ave SE, West Mercer Way, and 72^nd Pl SE
• Location 8 - Basin 32b, 12" - 36" diameter stormwater pipe in multiple locations along SE 72^nd St, West Mercer Way, Holly Hill Dr (by easement), and 78^th Ave SE
• Location 9 - Basin 45b, 12" - 18" diameter stormwater pipe along East Mercer Way and SE 57^th St (by easement)

Project Timeline

June 2026 - July 2026

Estimated Budget

$129,000

Contact

Zechariah Rodino, Utlilities Engineer, zechariah.rodino@mercerisland.gov