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City staff report PCI gains and lay out funding scenarios to protect Herriman roads
Summary
Herriman staff told the council a pavement study shows the citywide PCI rose from about 69.8 (2019) to roughly 74 (2024). Staff outlined treatment priorities and multiple budgeting scenarios — a $15 million 'fix‑all' option and a lower annual funding target (about $2.9M) to hold backlog steady — and urged continued preventive maintenance.
Herriman city staff presented results of a new pavement evaluation comparing 2019 and 2024 data, saying the city’s average pavement condition index rose into the mid‑70s while only a small portion of the network requires immediate reconstruction.
Bryce, a staff presenter, summarized the study’s findings: "our network PCI actually went up overall to 74." Staff described two data collection methods — a LIDAR/camera scan to map surface distress and a deflection test to assess structural condition — and said the combination helps target preventive treatments before roads fall below the reconstruct threshold.
The presentation included lifecycle analysis and recommended treatment types by PCI band. Staff explained that preventive surface treatments such as slurry seals and mill‑and‑overlays can be applied repeatedly to extend pavement life and avoid the much higher cost of full reconstruction once PCI drops below 40. "We're trying to keep the good roads in good condition," Bryce said, explaining the city's strategy of prioritizing preventive care where it yields the best long‑term return.
Staff presented budget scenarios and backlog figures. They said a one‑time "fix‑all" approach to bring the network to a target high‑quality band would cost on the order of $15,000,000, while holding the current backlog of sub‑40 roads steady would require roughly $2,900,000 per year. Staff also showed a projection that the city’s pavement program budget is forecast to grow toward about $3,000,000 in coming years and that staff have rolled forward reserves (approximately $750,000–$1,000,000) to help address a large 2027 project (Rose Crest Road).
Councilmembers asked for clarifications about how the PCI is measured, whether new subdivision roads are affecting the average, and how the city determines where to apply preventive treatments versus full reconstruction. Staff acknowledged that adding new roads can artificially raise the average PCI but said targeted program design and better data collection will help keep long‑term maintenance efficient.
The presentation also reviewed alternative pavement materials. Staff said concrete can last longer on high‑traffic corridors but costs about three times as much to construct and complicates utility repairs; pervious pavements need ongoing cleaning and have not routinely performed well in Herriman weather. Staff noted plans to continue evaluating technologies and to refine the cadence of condition surveys as cheaper mobile LIDAR options become available.
Next steps: staff will continue refining the capital plan and return with recommended budget allocations and implementation timing for council consideration.
