Developers and planning staff ask Wagoner County to review 3.9 pavement minimum in subdivision regs; commissioners table for two-week review

Developers, contractors and Wagoner County planning staff spent more than two hours debating a proposed review of the county's subdivision regulation language on roadway design standards and a cited minimum structural requirement (recorded in the packet as 3.9).

Why it matters: The county's subdivision standards determine pavement sections, base and treatment requirements for roads inside new subdivisions. Developers argued that a uniform minimum structural requirement can overbuild roads for lower-density, half-acre or larger-lot subdivisions, increasing per-lot costs (contractors estimated roughly $10,000 per lot on a recent project if the higher standard is imposed). Planning staff and contracted engineers countered that the current standards aim to reduce future failures and infrastructure costs that fall to the county.

What speakers said: Kenneth McMurtis, a local developer/contractor, argued the current written process requires geotechnical inputs and AASHTO-based design but is effectively overwritten by a fixed 3.9 minimum structural number that prevents use of site-specific engineering results. He said comparable neighboring jurisdictions use a performance-based AASHTO approach or different minimums for curb-and-gutter (higher) versus open-ditch/rural roads (lower).

Casey Sanders of planning and zoning told the board that staff reviewed Rogers and Tulsa County standards and found them similar to Wagoner County; staff recommended retaining the regulations because staff have seen subgrade construction issues in some developments that led to repairs years after construction.

Several developers and a design representative described modeling using AASHTO inputs and county-required soil/traffic parameters that produced structural numbers below 3.9 yet still met the 20-year design life used in standard pavement modeling software. They said the 3.9 figure appears arbitrary in the local context and requested a formal review comparing results from AASHTO-based performance design to the prescriptive minimum.

Board action: Commissioners voted to table the code-amendment matter for two weeks for fact-finding and comparative analysis. Commissioners asked staff to collect: examples of subdivisions built to the current standard and how they have performed, comparable standards and outcomes in Rogers and Tulsa counties, the engineering basis for the 3.9 figure (if available), and economic impact estimates on per-lot cost. The board set a follow-up discussion for two weeks (tentative date provided during the meeting).

Context and caveats: Planning staff reminded commissioners that Wagoner County has unique soils in places (highly plastic clays that swell and shrink) and that some areas are served by rural sewer (Real Water 4) which changes development patterns. Commissioners and developers both emphasized balancing long-term road performance and repair costs against initial affordability for developers and homebuyers.

Ending: The board asked staff to compile technical documentation and peer comparisons and scheduled the item for follow-up consideration at a future meeting to determine whether targeted amendments (for example, separating curb-and-gutter/high-density from rural/low-density design requirements) are warranted.