On the steep eastbound grade of State Route 58 between Bakersfield and Tehachapi, loaded trucks often slow to 30 miles per hour or more below the posted limit. Caltrans says that drag slows all eastbound traffic behind them. Trucks make up more than 36% of vehicles on the road between Bakersfield and Tehachapi, and as many as 8,000 cross the Tehachapi Summit each day, according to Tehachapi News.
The Keene Pavement Project is the fix for that stretch of highway, and Hart Flat Road sits right where its hardest piece begins. If you're buying acreage in Hart Flat or Keene and plan to drive 58 regularly, the main fact about this project is its moving calendar, more than its size. The schedule has already slipped once. As of late October 2026 there was no construction contract on the street, and the various published start dates span two years.
Hart Flat Road is where the third segment begins
On October 19, 2023, the California Transportation Commission voted to fold the State Route 58 Truck Climbing Lane Project into the Keene Pavement Project. Caltrans now manages both under the single Keene name. The combined scope covers 44.8 lane miles of pavement from Bealville Road to about two miles west of the State Route 202 junction in Tehachapi. It also adds a 3.5-mile, 12-foot-wide eastbound truck-climbing lane that ends about 0.4 miles west of Hart Flat Road.
Tehachapi News reported on a presentation to the Tehachapi City Council by Brian Wesling, Caltrans Deputy District 9 Director of Engineering. He described the work in three segments:
- Tehachapi Creek Bridge to Broome Road, the first 3.7 miles, which he expected to be the easiest
- Broome Road to Hart Flat Road
- Hart Flat Road to Bealville Road, the segment with the steepest grade and the new truck-climbing lane
Hart Flat Road is where segment two ends and segment three begins. In the same report, Wesling said the third segment will get the most benefit from the truck lane. Tehachapi City Councilman Phil Smith told Tehachapi News that the truck lane would be built in the third year of construction. For Hart Flat drivers, that means two separate work zones, one on each side of the exit, and the truck-lane benefit comes at the end of the project.
The Caltrans project page lists more changes near Hart Flat. The at-grade eastbound junction at Bena Road will be removed, and Bena Road residents will reach 58 through the State Route 223 junction instead. Bealville Road stays open to and from the highway. Caltrans says the project could include a wildlife crossing between Bealville Road and Hart Flat Road. The Wesling report mentions two new wildlife undercrossings. Neither source gives an exact location.
The calendar has already slipped once
The state funds this kind of work through the State Highway Operation and Protection Program, called SHOPP. The project was originally programmed under the 2024 SHOPP. When the Commission adopted the 2026 SHOPP on March 23, 2026, Kern County's comment called the project "a top priority for Kern." The Commission's response says the project "has recently been added to the 2026 SHOPP as a carryover project with an updated delivery year of FY26/27." A carryover is a project that wasn't delivered in the cycle it was first programmed for.
In its report on the project reaching a bidding milestone, Tehachapi News said the project would "go out to bid this summer," with construction expected to begin in 2027. Caltrans' own page set June 2026 as the "Ready to List" milestone. But as of late October 2026, the Keene project didn't appear on Caltrans' list of advertised construction contracts, and no Keene bid appeared among its recent bid summaries.
Smith told Tehachapi News that Caltrans studied this section of road back in 2002, and that "there's never been a question of it being needed." The need is settled. The timing isn't, and every date tied to this project has moved before, so a buyer shouldn't treat any single date as fixed.
Five price tags and four start dates
Each source published in the last two years gives its own version of the schedule and cost:
| Source | Construction start | Cost figure |
|---|---|---|
| 23ABC, February 2025 | Early 2027, about 2½ years | $257 million |
| Kern COG, July 2025 | Ready to list in 2025/26 | $222.7 million construction capital |
| Tehachapi News, Wesling presentation | Likely 2028, three segments over three years | $247 million |
| Tehachapi News, bidding-milestone report | 2027, three years | $267 million |
| Caltrans project page, current | Summer 2027, ending Fall 2030 | $231 million construction capital |
The figures measure different things at different points in the design process, so they won't reconcile neatly. "Construction capital" leaves out costs that a total project figure may include. Caltrans marks its own schedule as "subject to change." Both ready-to-list milestones, Kern COG's 2025/26 year and Caltrans' June 2026 date, have now passed without an advertised contract. Wesling's 2028 estimate is the one to plan around if you want a cautious reading.
What the construction years will mean for a Keene-area commute
In Wesling's description, each segment goes through the same sequence. First, crews widen the outside shoulders to make more room for traffic. Next, a temporary barrier protects the inside lanes while they're rebuilt and traffic uses the outside lanes. Then traffic moves to the finished inside lanes, with a 9-foot shoulder for breakdowns, while crews rebuild the outside lanes. Smith told Tehachapi News that 58 would drop to one lane with an extended shoulder for part of the project, though not for the full three years. He added that a big-rig tow truck would be on site for breakdowns, and that vehicles with oversized loads would likely need another route entirely during construction periods.
For a Hart Flat household, the order of work matters. If segments run in sequence starting at Tehachapi Creek Bridge, a trip toward Tehachapi will pass through work zones early in the project. A trip toward Bakersfield will cross segment three, the steep grade below Hart Flat Road, near the end. Caltrans hasn't yet published a timetable by segment, so neither period can be pinned to a season. On ranch and acreage properties, ask a seller or contractor about any equipment that might count as an oversized load, since the rerouting Smith described would apply to those loads.
When it's finished, the work is meant to last. Wesling described the paving material as the highest quality available, with a 40 to 50 year lifespan and little maintenance needed. He also listed 21 new retaining walls, 39,000 feet of new or upgraded guardrail, and 67,000 feet of new or upgraded median barrier.
How to read the dates if you're buying now
If you close on Hart Flat acreage this winter, Caltrans' official window of Summer 2027 to Fall 2030 falls within your first four years of ownership. If the start moves to 2028, the end moves later too. Plan around a range of years and expect it to keep moving.
The project page lists a construction contact, Public Information Officer Michael Lingberg, at (760) 920-0280 or [email protected], for updates as the schedule firms up. Once a contract number shows up on the Caltrans advertised list, you'll know the start date is getting close.
A short FAQ
Will the Hart Flat Road interchange close during construction? Caltrans hasn't published a ramp-closure or detour plan for Hart Flat Road or Broome Road. The only change to highway access that Caltrans has announced is removing the eastbound Bena Road junction.
Will Woodford-Tehachapi Road serve as the detour? No published plan names it as an alternate route. Caltrans' described approach keeps traffic moving on 58 itself, with lanes shifted as work progresses.
Does the truck lane reach Hart Flat Road? It stops about 0.4 miles west of it. The City of Tehachapi has said it hopes the lane will be extended in the years after construction.
If you're weighing a Hart Flat or Keene property and want to talk through how the Highway 58 work fits your commute and your timeline, Theresa Mann & Co follows this project closely and is glad to walk the property and the route with you. Book a Consultation and we'll go over the current Caltrans schedule together.
