The detour bridge into Winterhaven is eroding. Here's what Imperial County says it's doing about it.

Developing story. Based on Imperial County Public Works' Oct. 20 report to the Board of Supervisors. We'll update it when the county announces a contractor and a start date for repairs.

When the Picacho Road Bridge closed in March 2025, the traffic had to go somewhere. It went to the Arnold Road Bridge.

The county says closing Arnold Road would close the only available detour. And the bridge has its own problem.

What's wrong with it

The Arnold Road Bridge crosses the Reservation Main Drain in Winterhaven. In April, according to an Imperial County Public Works report, the department was told the bridge was “in risk of undermining due to significant erosion.” The same report spells out why that matters: “Closing Arnold Bridge would close the only detour route available for the Picacho Road closure.”

The county first tried to fold the Arnold repair into the existing Picacho emergency contract, to move faster. County Counsel said in May that wasn't allowed. So on May 19, 2026, the Board of Supervisors declared a separate emergency for Arnold Road.

A Caltrans inspection in February had found erosion of the embankments around the bridge but no structural damage to the bridge itself, the Imperial Valley Press reported at the time. Public Works Director David Dale described the declaration as an effort to keep “the only other bridge being used as a detour for the area” from failing.

Supervisor John Hawk put it more simply: “If we lose that bridge, that is a major problem.”

The county's Oct. 20 report does not say the bridge is about to fall. It says the ground around its ends is washing away and needs to be rebuilt before it becomes a bigger problem.

The plan

According to the county's Oct. 20 report, the fix is to reclaim and fortify the eroded embankments at the bridge's abutments with compacted native soil, slurry, rip-rap bags and rip-rap rock.

Two details in that report are worth knowing if you drive it:

• The bridge stays open during the work. The report says it “is to remain open during repair work as it is the only route for the detour being used due to the Picacho Road Bridge closure.”
• It's being inspected every week, and the county says that will continue.

Five months of preparation

An emergency declaration lets a county skip some of the usual bidding steps. It doesn't make engineering instant. Here's the path from the May declaration to the point where a contractor could be hired, per the county:

• Late May to early June: Draft agreements for construction, a resident engineer and geotechnical testing go to County Counsel. The Public Works director asks staff to get three proposals for construction.
• June 3: The director sends the draft request for proposals back with changes, including dropping a slope-stability study and having staff write a repair plan for the contractor.
• June 18 to July 21: A geotechnical firm, Aragon Geotechnical, inspects the eroding embankment, reviews the draft repair plans and recommends changes.
• Aug. 14: The geotechnical engineer signs off on the revised plans.
• Aug. 27 to Sept. 8: Plans are revised again to keep the work inside the county's right-of-way, re-approved and signed by the director.
• Sept. 24: The county's planning department issues an environmental exemption.
• Sept. 28: The county issues a request for proposals for emergency construction.
• Oct. 12: Proposals due.

That's where the public record stops. The report, written for the Oct. 20 meeting, doesn't say whether any proposals came in, who won or when construction starts.

On cost, the report's cost line reads “N/A,” and lists California's SB 1 road maintenance and rehabilitation account as the funding source. It says there will be no impact to the county's General Fund. That's not the same as saying the job is free, and no dollar figure has been released.

The question the Tribe is asking

In its Oct. 21 statement, the Quechan Tribal Council asked the county for something specific: an emergency-access plan, developed with Quechan Tribal Police, Fire and Health, “in case the Arnold Road Bridge fails.”

It's a fair question to ask about any single point of failure. The county's Oct. 20 report describes repairs and inspections. It doesn't describe a plan for what happens to ambulance runs, school buses or patients headed to the Fort Yuma Health Care Center if Arnold Road had to close. That doesn't mean no plan exists. It means none has been made public.

The next useful piece of news here is a short one: a contractor's name and a start date. We'll add it when the county has one.