Palm Desert advances mobility plan; Portola interchange kept as long‑term priority amid funding questions

Consultants for the City of Palm Desert presented an updated mobility element to the City Council at a Sept. 25 study session, proposing new policies on safety, vehicle miles traveled (VMT), evacuation resilience, truck routes and several roadway reclassifications.

Brian Wolf of Baron Piers said the update packages recent local plans and state mandates into the general plan and will move into the CEQA phase this fall. "There are three main motivators for this update" he told the council, citing the need to clean up roadway cross sections, memorialize newly adopted plans such as the Vision Zero action plan, and address legislative requirements that have emerged since 2016. He added the draft includes updated design standards aimed at safety and multimodal travel.

The presentation addressed two technical metrics that shape local transportation decisions: VMT, the CEQA metric now used to measure driving impacts under SB 743, and level of service (LOS), a traditional congestion measure the city proposes to retain for local planning. Wolf summarized the modeling results, saying the Portola Interchange would shorten average trip lengths citywide and "we see around, almost a one mile per person decrease in VMT" in the consultant's analysis.

The Portola Interchange — described as "very long‑desired" — was presented as a long‑term priority with substantial remaining funding needs. The consultant cited an estimate of about $88 million in 2018 dollars for the project; council members and others in the discussion said that figure has likely risen with inflation and additional scope (speakers in the meeting suggested updated estimates in the low‑hundreds of millions). Consultants and staff said including Portola in the mobility element helps the city's case when pursuing funding from agencies such as CVAG, RCTC and state or federal programs, but they acknowledged funding is not yet secured.

The update also proposes targeted reclassifications to better match roadway function on the ground: Country Club Drive was recommended to change from a vehicle‑oriented arterial with potential for six lanes to a "balanced arterial" that preserves four lanes and allows bike facilities. For Highway 111 the draft includes concept designs intended to provide complete‑street improvements, support for transit and activated frontage roads while recognizing high capital costs and community input will shape final design.

Consultants addressed truck routes required under AB 98 and showed proposed changes intended to avoid sensitive receptors such as schools and parks. The consultant said compliance will rely on signage, an ordinance and public outreach; weight restrictions and police enforcement are tools local agencies often use when routing and enforcement become an issue.

Council members pressed staff on enforcement and data sources. On enforcement, the consultant said posting signage, publishing routes online and formal ordinance adoption are the primary tools, followed by targeted weight limits and coordination with police for enforcement where misuse occurs. On data, the consultant said traffic counts and established travel‑time analysis methods were used, and the city incorporated available CV Sync data where relevant.

Next steps described to the council are completion of the CEQA consultation (including adjacent‑tribe outreach), formal adoption of the mobility element and the transportation study guidelines (local VMT thresholds and LOS policies), and moving toward an implementation matrix to guide capital programming and funding outreach.

The council provided mixed direction — supportive of the plan's goals but cautious about the cost and timing of large capital projects — and asked staff to return with refined costs, funding options and potential alternatives if major projects such as Portola prove infeasible in the near term. The study session moved on after the consultant closed the presentation.