Association Meeting�Thursday, March 19, 2026

Welcome!

• 4CNA Board Introductions
• Call to order
• Approve previous meeting minutes

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Meeting Agenda

Officer Liaison Reports

Committee Reports

Treasurer Report

Donations may be made via card at fourcreeksna.org or in-person by cash or check.

Make checks out to Four Creeks NA.

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Thank you for keeping 4CNA funded!

Checking Account Transaction History

Road and Intersection Capacity Issues

Assuming Planned Improvements are Built

Seven independent traffic studies commissioned for developments in the corridor

all project 2028 conditions with planned infrastructure credited as complete.

Even under those assumptions, roads and intersections are failing.

NE 179th Street Corridor • Neighborhood Association Briefing • March 2026

Land Use & Transportation Report

What these 2028 numbers assume as built

Every V/C ratio and LOS grade in this presentation comes from 2028 projections that credit the following improvements as complete:

I-5/179th interchange

Reconstructed as roundabouts

Reality: Not yet started — 2029–2031

NE Delfel Road

Realigned and rebuilt as roundabout

Reality: Design phase — 2029–2031

NE 15th Avenue intersection

Rebuilt as roundabout

Reality: Design phase — 2028–2030

NE 179th St at NE 29th Ave

Rebuilt as roundabout

Reality: Under construction — Dec 2027

NE 179th St widening (10th–26th)

4 lanes with center turn lane

Reality: Design phase

NE 179th St widening (29th–50th)

4-lane capacity (Pr-4cb, 1,800 veh/hr)

Reality: 2031–2033 — NOT reasonably funded

NE 10th Ave relocation

Relocated opposite NE 15th Ave

Reality: Design phase

NOT assumed built:

NE 50th Ave permanent roundabout — not scheduled until 2035+, not reasonably funded. Only interim configuration modeled.

The scale of the problem

17+

Road segments

over capacity

V/C exceeding 0.90 by 2028

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Intersections

at LOS F

Confirmed across multiple studies

7 of 7

Studies showing

failures

Every study finds the same problems

Data from: Three Creeks East, Four Creeks North, NE 174th St Subdivision, Kozy Manor Estates, Towhee Creek, Ridgefield MS, Mt Vista Logistics

NE 179th Street corridor — road segments

V/C ratio, 2028 PM peak — with planned improvements credited as constructed

0.90 failure threshold →

NE 10th Ave: 189th–179th St

Four Creeks North, NE 174th St, Towhee Creek

1.33

NE 179th St: I-5 to NE 15th Ave

Three Creeks East, Four Creeks North

1.17

NE 50th Ave: 179th–174th St

Three Creeks East

1.13

NE 179th St: Delfel Rd to I-5

Three Creeks East, Four Creeks North, Towhee

1.05

NE 10th Ave: 199th–194th St

Three Creeks East, Ridgefield MS

1.01

NE 15th Ave: 179th–174th St

Three Creeks East, Four Creeks North

0.99

NE Delfel Rd/10th Ave: 189th–179th

Three Creeks East, Towhee Creek

0.92

Over capacity (1.00+)

Approaching failure (0.87–0.99)

These numbers already credit the interchange, roundabouts, and road widening as constructed.

Salmon Creek area & connecting routes

V/C ratio, 2028 PM peak — the problem extends south

0.90 failure threshold →

NE 10th Ave: 149th–139th St

Towhee Creek

1.08

NE 139th St: 10th–20th Ave

Three Creeks East, Towhee Creek

0.93

NE 139th St: 20th–23rd Ave

Three Creeks East, Towhee Creek

0.92

NE 134th St: 20th–23rd Ave

NE 174th St TIS

0.87

Two independent consulting firms document the same segments failing — this is systemic, not isolated.

Over capacity (1.00+)

Approaching failure (0.87–0.99)

Intersections failing or at the breaking point

AT THE BREAKING POINT — LOS E or V/C > 1.0 despite passing letter grade

V/C >1.0

I-5 NB Ramps / NE 179th St

Three Creeks East, Four Creeks North

LOS C but over capacity — 2028

V/C >1.0

NE 179th St / NE 15th Ave

Three Creeks East, Four Creeks North

LOS C–D but over capacity — 2028

LOS E

NE 50th Ave / NE 159th St

Mt Vista Logistics

One more car pushes this to failure

LOS E

NE 72nd Ave / NE 159th St

Mt Vista Logistics

Signal warrants met — should be LOS D

Intersections failing or at the breaking point

ALREADY FAILING — LOS F

LOS F

NE 179th St / NE Delfel Rd

Three Creeks East, Towhee Creek

Existing 2025 — failing right now

LOS F

NE 179th St / NE 50th Ave

Three Creeks East, Kozy Manor, NE 174th St

Background 2027–2028 — fails without new project

LOS F

NE 184th St / NE 29th Ave

Ridgefield MS

2029 total traffic, AM peak

LOS F

NE 159th St / NE 72nd Ave

NE 174th St TIS

Background 2028 — WB approach failing

What these numbers don’t include

City of Ridgefield growth is not in these models

None of the seven traffic studies include City of Ridgefield developments in their in-process assumptions.

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City of Ridgefield traffic uses NE Delfel Road and NE 10th Avenue to reach I-5 at the 179th interchange — the same segments already showing V/C ratios of 0.92 to 1.33.

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The actual future conditions on these roads will be worse than any of these studies show.

Additional development compounds the problem

Each additional approval adds traffic to the in-process pipeline used in subsequent studies. With road segments and intersections already at or near the threshold, additional development will compound the capacity shortfall shown in the data.

The bottom line

Based on these traffic studies, with the developments approved to date and vested trips, road segments and intersections in the 179th corridor are already reaching capacity — assuming the planned infrastructure has been built.

The infrastructure isn’t built yet.

These projections do not include City of Ridgefield growth, which loads the same roads. And each new development approval adds to the in-process pipeline that pushes these numbers higher.

Seven independent consulting firms. Seven separate applications. The same result every time.

The pace of development has outrun the infrastructure to support it.

Sources: Three Creeks East TIS (Jun 2025), Four Creeks North TIS (Apr 2025), NE 174th St TIS (Dec 2025), Kozy Manor Estates TIS (Feb 2025), Towhee Creek TIS (Dec 2025), Ridgefield MS TIS (Jun 2024), Mt Vista Logistics TIS (Jan 2023)

4CNA Board Elections

4CNA Annual Election Process

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All executive board roles are up for election annually.

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Committee Chairs serve at the discretion of the board. While they are not elected, we will announce the roles and volunteers at the meeting.

4CNA Annual Election Process

Roles up for election:

1. President
2. Vice-President
3. Treasurer (critical open role)
4. Secretary

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Other roles needed:

1. Land Use Chair
2. Something you believe is necessary and are willing to do

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4CNA Annual Election Process

Nominations

Any resident of Four Creeks Neighborhood Association may nominate themselves or another Four Creeks resident.

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Eligible candidates may be nominated any time before the vote, including at the election meeting. Per the bylaws, Article 10, Section 3:

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Nominations at the Election meeting shall be opened up to eligible candidates present.

4CNA Annual Election Process

Election Meeting

Nominees will have an opportunity to introduce themselves and provide a statement.

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The statement may include background information, why they are interested in the role, how they will approach the role, and more.

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The nominee statement is not required. Additionally, we will try not to limit nominee statements, but the general rule is 2 minutes or less.

4CNA Annual Election Process

Voting Process

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Voting will take place in-person and by paper ballot ONLY.

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Per the bylaws, Article 10, Section 6:

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To be by written ballot. An affirmative vote on ballots cast by a majority of those members in attendance at a general Association meeting shall be required for election.

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4CNA Annual Election Process

Counting Process

Votes will be tallied and winners announced before the meeting is adjourned, barring any limitations on time, such as the room being needed.

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If additional time is needed, a day and time will be set within 5 days for board members and any interested residents to meet and complete the count.

2026 Board Elections

179^th St Plan Updates

WSDOT - Sarah Hannon-Nein & Tiffany Mancillas 

WSDOT Clark County Engineering Office

March 2026

I-5 / 179th Interchange Improvements Project

Four Creeks Neighborhood Association Meeting

Sarah Hannon-Nein, Communications

Tiffany Mancillas, Communications

Project Overview��

Location

• Located on I-5 at 179th Street (~milepost 9.5) at the north end of the Vancouver urban area, transitioning into rural Clark County.

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Nearby Events & Destinations

• Clark County Fairgrounds & Event Center
• 10-day Fair and year-round events
• Cascades Amphitheater
• concerts most weeks, May–October

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Corridor Users

• Serves commuters, freight, businesses, event traffic and local residents.

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Project Overview��

Overview

Improve safety and mobility at the I-5 / NE 179th Street interchange by replacing existing signals with roundabouts, replacing the I-5 bridges and addressing fish passage barriers to enhance access for drivers, freight, and people.

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Safety & Mobility

• Roundabouts will reduce serious crashes and keep traffic moving smoothly through the interchange.
• New shared-use paths and crossings make it safer and easier for people to walk, bike, or roll through the area.
• Upgraded ramps, lighting and signs improve overall safety and travel flow for all users.

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Growth

• The 179th Street area is seeing rapid development, with new housing and businesses planned nearby. The existing interchange can’t handle current or future traffic from area growth.
• The interchange improvements will support this growth by reducing congestion and improving access to I-5.
• The project works in coordination with Clark County’s corridor upgrades and nearby developer projects to handle future traffic needs.

Project Timeline��

• 2015: Project identified in Connecting Washington funding package.
• 2017–2019: WSDOT coordination with Clark County corridor planning.
• 2019: Legislature provided $500,000 for interchange concept study.
• Conducted traffic modeling, interchange type evaluation and concept development.
• Completed early planning and community outreach (open houses, surveys, Clark County Fair booth).
• 2024: Open house and public survey to gather feedback
• 2025: Design phase starts
• 2026: Open House
• 2028: Project advertisement
• 2029: Construction begins
• 2031: Construction complete

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Community Engagement��

What we heard…

• Safety and congestion are top priorities.
• Event traffic is a concern.
• Keep traffic flowing and improve bike/pedestrian access.
• Minimize construction impacts on businesses and neighborhoods.
• Vehicle sizes to ensure roundabouts accommodate all vehicle types, including large trucks.
• Travel patterns to help plan construction staging.

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Where we are now…

• Refining interchange design.
• Evaluating bike/pedestrian facilities.
• Coordinating with Clark County corridor projects.

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What’s next…

• Complete design details and environmental review.
• Develop construction staging and event traffic plan.
• Hold another Open House in late 2026 to share project information and seek feedback.
• Continue coordination with County and local partners.

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Project Areas & Key Work��

1. WSDOT Interchange Improvements project

• Improvement/mobility
• I-5, ramps and ramp terminals
• Construction start 2029

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2. Clark County Delfel Realignment project

• West of the interchange
• Realigns Delfel Road, north of 179th Street
• Construction start 2029

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3. Clark County 15th Avenue Extension project

• East of the interchange
• Extends 15th Avenue, north of 179th Street
• Gap section (WSDOT design/construction)
• Construction start 2029

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4. Clark County 15th Avenue to 26th Avenue project

• East of the interchange
• Extends improvements on 179th Street
• Construction start 2028

NOTE: There are developer projects planned near the northeast and southeast areas of the interchange, with construction start dates not yet determined.

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2

3

4

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Project Concept

DRAFT

Roundabouts

• Remove existing signals.
• Build two-lane roundabouts at the northbound and southbound ramp terminals.

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Bridges

• Replace the two existing three-span bridges over 179th Street with two two-span bridges.
• One span will cross 179th Street, the other will cross a new open channel (drainage path to improve fish passage and stormwater flow).

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I-5

• Raise I-5 by approximately 4–5 feet.
• Reconstruct I-5 between the tie-in points.

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Ramps

• Lengthen the southbound off-ramp from I-5.
• Modify ramps as needed.
• Install metering on the on-ramps.

Project Scope��

Bike & Pedestrian Improvements

• Build two shared-use paths along 179th Street.
• Add safe crossings of 179th Street and on- and off-ramps within the interchange.

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Fish Passage

• Replace the existing pipe under I-5 with a new open stream channel so fish can move freely.
• The new stream will run north of 179th Street and pass under the new I-5 bridges and ramps.
• WSDOT’s section connects with Clark County’s upstream project near Delfel Road.
• The new channel will have a gentle slope to support fish passage and an 18-foot minimum opening under each structure.

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Other

• Build drainage systems to manage runoff.
• Add new traffic technology, signs and street lighting.
• Acquire property (right of way) as needed to support project improvements.

Project Scope��

Why Roundabouts?��

Roundabouts

• Keep traffic moving continuously with fewer long backups.
• Proven to reduce crashes and injuries (up to 75% fewer injury crashes).
• Handle all users: freight, commuters, bikes and pedestrians, etc.
• Trucks can navigate the roundabout by driving up and over the truck apron.
• A truck apron is a raised section of concrete that acts as an extra lane for large vehicles.
• The back wheels of the oversize vehicle can ride up on the truck apron so the truck can easily complete the turn.
• Lower long-term maintenance and costs.

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Event traffic

• Roundabouts handle event traffic more efficiently than signalized intersections, reducing the need for manual traffic control.
• Temporary manual traffic control (flaggers) will continue during major events when traffic volumes are highest.

Stay Updated

• Visit the project webpage
• Sign up for project emails
• Watch for 2026 open house

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Questions?

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Current Interchange

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NE 179th St & NE 29th Ave Intersection Improvements

Clark County Public Works

NE 179^th Street Projects – Anticipated Construction Start

NE 179^th STREET IMPROVEMENTS

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Upcoming Construction Start Dates

1. NE 179th St. and NE 29th Ave.: 2025 (ongoing)
2. NE 179th St. (NE 15th Ave. to NE 26th Ave): 2029 (early spring)
3. NE Delfel Rd. (NE 179th St. to NE 184th St.): 2029 (summer)
4. NE 15th Ave. (NE 179th St. to NE 10th Ave.): 2029 (late fall)
5. NE 179th St. (NE 29th Ave. to 50th): 2031
6. NE 179th St. and NE 50th Ave.: 2035+

2025

2029

2031

2035+

2029

2029

WSDOT

Projects on 179^th – Are they connected?

Answer: Yes. The projects are on separate timelines for construction. They are designed to connect and fit together including the projects adjacent to WSDOT’s work on the interchange.

Collaborative Work Areas: County & WSDOT

• Preliminary coordination is underway with WSDOT supporting the County in the design and construction of these areas.

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NE 179^th St/NE 29^th Ave Project Overview

Roundabout Footprint

New Stormwater Facility

New Bridge

New Bridge

Existing Road with Roundabout Footprint

Current Stage – North and East Legs

Why is the road closed if it looks like I can go through?

• Safety
• Active worksite with hidden hazards and unsafe roadside conditions in the work area
• Consistent Communication
• With partner organizations (Police, Fire, Schools, etc.)
• Road users
• Contractor Access
• Access on hard surface during winter months

Upcoming Stage – Summer 2026

NE 50^th Avenue Sewer Work

• Private development project
• New deep sewer installation
• Temp signal at NE 72^nd Avenue/NE 159^th Street
• Alignment with current 179^th Avenue closure impacts
• Traffic control and closures approved by Council in January 2026
• 80-day closure

New sewer line in the middle of the road.

Existing Road Elevation

New sewer line elevation

Profile View

Plan View

NE 50^th Avenue Sewer Work

Detours and Access

NE 179^th STREET IMPROVEMENTS

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3/19/2026

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Thank you for joining us – Questions?

Project Contacts

Other 179^th Corridor Information and Resources

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NE 179^th Corridor Project FAQ: https://clark.wa.gov/sites/default/files/media/document/2026-03/179th-corridor-faq.pdf

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Other NE 179^th /NE 29^th Intersection Improvement Information and Resources

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NE 179^th/NE 29^th Ave Project Info Page: https://clark.wa.gov/public-works/northeast-179th-street-and-northeast-29th-avenue-intersection-improvements

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Road Construction FAQ: https://clark.wa.gov/sites/default/files/media/document/2026-03/road-construction-faq.pdf

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Q&A - Four Creeks NA Board Questions

Q: Are there plans to put sound walls around the intersection of I-5 and 179th?

A: WSDOT will lead the design of the interchange and is most knowledgeable to answer this question.

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Q: RTC modeling says there will be a 40 mph speed limit on 179th, but there are 13 roundabouts in a 3.5 mile stretch. What do you think is a realistic average speed through there?

A: Roundabout are designed to accommodate continuous flow of traffic at 20-25 mph. Once completed, the corridor may see 30-35 mph speeds between roundabouts and slower 20-25 mph speeds through roundabouts.

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Q: It looks like the construction at 29th has stalled. Is there something happening that is causing it to stall? Generally, it feels like projects are taking a really long time with lanes closed for extended periods, and we're curious about why.

A: Our Contractor is responsible for managing the construction schedule. Occasionally, they will adjust work sequencing to adjust to a variety of circumstances (weather, material availability, subcontractor schedules, etc.). This means there will be times when the site is very active and other times less activity. Once the major bridge work begins this summer, there will likely be much more activity around the site.

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General Project Updates

Clark Regional Wastewater District – Les Macdonald

NE 179^TH STREET CORRIDOR�FOUR CREEKS NEIGHBORHOOD ASSOCIATION MEETING

CLARK REGIONAL WASTEWATER DISTRICT

March 19, 2026

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Les MacDonald, P.E.

Planning and Development Program Manager

Questions?

Resident Open House

Time Permitting

Motion and vote to adjourn

Meeting Adjourned!