Projects — TIB Project Information

TIB Project Information

City of Issaquah's 12th Avenue NW

8-1-108(012)-1

Summary
Information & Schedule
Funding
Description
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Delays
Payments

8-1-108(012)-1
12th Avenue NW
SR 900 to Lake Dr

FY 2023 Urban Arterial Program
Current Phase : Audit
Total TIB Funding : $3,000,000

County: King | Legislative District: 5 | Project Length: 0.22 | TIB Engineer: Greg Armstrong | Last Payment Date: 03/17/2025

Project Information

Lead Agency	ISSAQUAH
Funding Year	2023
Program	UAP
Current Phase	Audit
Legislative District	5
Congressional District	8
Federal Route Number	1321
Project Length	0.22 mi.
ADT	5,600
Functional Class	Collector
Type of Work	Minor Widening
Project Contact	Jim Jacobe
Contact Email	jamesj@issaquahwa.gov
TIB Engineer	Greg Armstrong
Last Payment Date	03/17/2025
Cultural Resource Assessment	Not Required

Project Schedule

	Target Date	Actual Date
Project Selection Date		11/19/2021
Delayed Project Date	01/01/2023
DAHP Assessment Date
Predesign Approval
Design Approval	02/10/2022	02/10/2022
Bid Auth. Approval	01/10/2023	01/04/2023
Construction Approval	02/06/2023	02/13/2023
Project Closeout	02/28/2025	03/06/2025
Audit Date		03/17/2025
Withdrawn Date

Project Funding

	TIB Funds	Project Costs
Environmental Study	0	0
Design Study	0	0
Total Predesign	0	0

Special Study	0	0
Design	0	0
Right of Way	0	0
Total Design	0	0

Construction Engineering	336,711	1,127,518
Construction Contract	2,650,360	4,247,517
Other Construction	12,929	55,000
Total Construction	3,000,000	5,430,035

Total TIB Funding	3,000,000	5,430,035

Local Funding Partners

	Funding Amount	Percent
ISSAQUAH	0	0.0%
WSDOT Funding	0	0.0%
Costco	2,430,035	44.8%







Total Local Funding	2,430,035	44.8%

Project Description

This project will construct an additional left turn lane from westbound 12th Avenue to southbound SR 900 and an exclusive right turn lane from northbound SR 900 to eastbound 12th Avenue. The added turning capacity will reduce congestion by decreasing delay and queue lengths. The reduced queue lengths as a result of this project will help minimizing frequent rear end collisions for northbound and westbound traffic and collisions at the PCC driveway, due to left turning queue that extends past several commercial driveways. The project will eliminate the permissive portion of the left turn phase from westbound 12th Ave to southbound SR 900, which is another frequent collision at this intersection.

Existing Condition

The community needs this project to support economic growth, relieve congestion, and improve safety. Costco Wholesale Corporation is headquartered in Issaquah and their campus is growing. The City of Issaquah and Costco have a development agreement to expand their corporate campus by up to 1,500,000 square feet. The development agreement identified three transportation projects that were needed to support the development and this project is the third and final transportation project. The City’s comprehensive plan has determined future growth will be within the Central Issaquah Area. This project is in Central Issaquah and is needed to relieve existing and future congestion from Costco’s expansion and redevelopment of Central Issaquah. The project is needed to improve safety at this high accident location. The 95th% queue exceeds storage capacity, causing frequent rear end collisions and collisions at the PCC driveway. Collisions are also occurring during the permissive portion of the left turn phase from westbound 12th to southbound SR 900.

Project Benefits

The project will improve both internal and regional traffic circulation by increasing capacity at a congested intersection while improving safety. It enables a Fortune 500 company, Costco Wholesale, to stay in Washington and expand by 1.5 million square feet of corporate office with 250,000 square feet of retail space. The expansion is expected to generate approximately 5,000 new jobs.

Project Pictures

Fullscreen View

Project Delays

Delay Type	Resolution Date	Comments
No delayed project history.