Much of the traffic on Ten Mile and Black Cat roads in northwest Meridian comes from one fact: State Highway 16 currently ends at Chinden Boulevard. When the extension to Interstate 84 opens, the Idaho Transportation Department's projections put the largest relief on those two-lane-era roads. Ustick Road is expected to pick up traffic. Eagle Road, the corridor most people ask about, sits on the list where officials disagree. If you're comparing homes in west Meridian during 2026, part of the rush-hour traffic you see on a tour comes from a construction phase with a published end date.
ITD's September 10, 2026 newsletter put the new corridor at 60 percent complete and said it is expected to open in mid-2027. That puts the remaining window at roughly nine months, which matches the length of a typical search, closing and first summer in a new home.
Why the Dead End at Chinden Matters More Than the New Pavement
Today, drivers heading south on SH-16 have nowhere to go once they reach Chinden. Caleb Hood, Meridian's deputy director of community development, explained the effect to the Idaho Statesman: southbound drivers leave the highway at Chinden and switch to Ten Mile and Black Cat to keep going south. He said those roads "weren't built to handle the traffic that is coming from the north." He expects them to ease once the extension carries that traffic all the way to I-84.
That turns the freeway into a story about redirecting traffic. The new road takes over a job that neighborhood arterials have been doing by default. ITD describes the finished project as a four-lane, limited-access highway with interchanges at I-84, Franklin, Ustick, US-20/26 and SH-44. Jeff Ryan, ITD's resident engineer, told the Idaho Press that because the highway is controlled-access, it can't turn into another Eagle Road. It will run like a freeway, without Eagle Road's stops and starts.
The Forecast, Road by Road
The most detailed projections come from a 2018 ITD analysis reported by the Statesman. It compares 2040 traffic demand with SH-16 built against a 2040 in which it was never built. These numbers are planning forecasts, not measured results, and they describe the long run more than opening day.
| Road | Projected 2040 change with SH-16 vs. without |
|---|---|
| Ten Mile Road | About 30% less traffic demand |
| Linder Road | About 15% less |
| Black Cat Road | 10% to 20% less |
| Star Road | About 10% less |
| Ustick, Linder to Can-Ada | An increase of less than 10% |
| Eagle Road | No figure reported; officials disagree |
The pattern follows the mechanism Hood described. The roads closest to the new corridor that run north-south, and that currently catch traffic leaving SH-16 at Chinden, gain the most. Relief fades as distance from the corridor grows. Ustick runs east-west and has an interchange on the new highway, so it becomes a feeder, which is why it's the one road projected to get busier.
Eagle Road Is Where the Experts Part Ways
ITD's own engineer is cautious. "Everyone wants to know about how it will impact Eagle Road, but Eagle Road is actually a little too far away for this to have a huge impact," Ryan told the Idaho Press. "I think it could pull a little bit of Eagle Road traffic, but I don't think people are going to notice a difference." He added that it would help the Ten Mile and Garrity exits on I-84.
Meridian City Council Member John Overton is more hopeful. He told the Statesman that SH-16, together with the new I-84 overpass at Linder, should help "reduce traffic on some of our major routes," especially Ten Mile, Eagle and Meridian roads. The two views apply to different projects. Overton was counting the Linder overpass as well, while Ryan was speaking about SH-16 alone. For a home that depends on Eagle Road, the safer working assumption is the engineer's. The freeway on its own isn't expected to change the daily drive much there.
Ustick Takes On the Change, on a Split Schedule
The Ada County Highway District has been widening Ustick in segments to absorb the new traffic. ACHD spokesperson Rachel Bjornestad told the Statesman she "definitely" expects impacts to ACHD roads and pointed to the Ustick widening as part of the agency's response. The segments are on very different timelines.
- Ustick, Black Cat to Ten Mile. ACHD lists this project as substantially complete. It was designed for two lanes in each direction, turn lanes or medians, and 10-foot multi-use paths. A May 1, 2026 update said Black Cat south of Ustick reopened April 30, with signal work still being finished.
- Ustick, Ten Mile to Linder. This is the segment that slipped. In an October 9, 2026 update, ACHD said construction is now expected to continue into Spring 2027, even though the contract's substantial completion date is November 12, 2026. The contract lets ACHD fine the contractor for each day past that date.
- Ustick, McDermott to Black Cat. This is the stretch closest to the new interchange. ACHD's timeline shows property acquisition in 2026 and construction starting in 2027. The plan calls for two lanes each way with a center turn lane and buffered 10-foot paths, plus expanded, signalized turn lanes at Ustick and McDermott built in cooperation with SH-16.
The timing creates a real overlap. The freeway is expected to open in mid-2027, the same year construction is scheduled to start on the Ustick segment nearest the interchange. For anyone weighing a home that uses Ustick west of Black Cat, 2027 could bring both the new feeder traffic and orange barrels at once.
The Interchange Corners Are Being Planned Around Traffic, and Sewer
The undeveloped land near the new Chinden interchange is filling with plans, and both approved concepts were shaped to keep traffic off the main roads.
On the southwest corner, North Meridian Fields won City Council approval 5 to 1 after a public hearing on April 14, 2026, the Idaho Statesman reported. The 70-acre annexation sets aside about 48 acres for homes, which could mean anywhere from 144 to 382 single-family houses, and about 25 acres for shops and employment. The developers said they wouldn't build high-traffic businesses such as gas stations, convenience stores, storage units or car washes. They haven't said what will go there instead. According to the Statesman, the deciding argument came from a city engineer and concerned sewer service: Meridian and a Star taxing district are competing over who will serve the area, and whoever does gets a say in it. The approval came with conditions. The developer has to return with detailed residential and commercial plans before building.
Across SH-16 on the southeast corner, a project called Chinden16 has filed permit documents for 61 single-family homes and five "mixed employment" buildings, BoiseDev reported on August 5, 2026. The applicant is Franklin Sensors, a Meridian company that makes stud finders and digital levels. Its largest building would house the company's management, engineering, manufacturing and inventory. The company has 90 employees today, and the filing says that could double. The site will have no access from Chinden or SH-16. Its only two entrances are on the southern edge, reached through neighborhood streets, and the filing names "minimal daily traffic" as a key goal.
Both corners are designed around the idea that the arterials near the interchange will be busy and that whatever gets built there shouldn't add to it.
A Timeline for a Move in the Next Year
- October 15, 2026. ITD scheduled a full overnight I-84 closure between Garrity and Ten Mile, 10 p.m. to 5 a.m., to place bridge decks, with traffic detoured to Franklin Road.
- November 12, 2026. This is the contract completion date for Ustick, Ten Mile to Linder. ACHD now expects work there to run into Spring 2027.
- Through 2026. Crews are pouring bridge decks on the I-84 flyover ramps, paving ramps at Franklin, installing signs and lighting at Ustick, and finishing utility and lighting work at US-20/26. At SH-44, traffic has moved onto new northbound ramps while the old pavement comes out for the interchange bridge.
- 2027. Construction is expected to start on Ustick, McDermott to Black Cat.
- Mid-2027. ITD's target for opening the full corridor. The agency notes that estimated dates can change.
Quick Answers
Will interchanges open one at a time? ITD spokesperson Jill Youmans told the Statesman in January 2026 that the agency will wait to open the freeway until the "full corridor is complete," which helps keep the overall schedule on track.
How much faster will the drive be? ITD officials estimate about 10 minutes from I-84 north to State Street, and about 20 minutes from I-84 to Emmett, which they describe as nearly half the current time. These are estimates made before opening, not measured results.
What does the project cost? Published figures differ. The Statesman called the freeway a $400 million project in January 2026, and an ITD fact sheet describes a $429 million investment for SH-16 between SH-44 and I-84. The sources don't reconcile the two.
If you're deciding between a home off Ten Mile, one near Ustick, or one that depends on Eagle Road, timing matters as much as location for the next year. Nicole Morgan can walk you through how a specific address lines up with the SH-16 and ACHD schedules before you write an offer, and sellers along these corridors can request a free home valuation that reflects where the road work stands.
