Wagoner County conditionally approves Southbrook 3 final plat after drainage review
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Summary
After several months of review, commissioners granted conditional final plat approval for Southbrook 3 — a 17.84-acre, 24-lot subdivision — contingent on a county engineer letter and a phase‑4 mitigation plan to address drainage issues raised by an outside reviewer.
The Wagoner County Board of County Commissioners on April 7 gave conditional final‑plat approval to Southbrook 3, a 17.84‑acre subdivision with 24 lots, after engineers raised concerns about drainage calculations and a potential 1.45% increase in downstream flows.
Grant Moore, an engineer with WSB (formerly Meshech Associates), told the board that his review of Southbrook 3 “caught several, important drainage issues that do not meet either the current county regulations or the previous 2008 regulations,” and that the design, as submitted, could increase flows to downstream properties. Moore said some elements of the submittal used a calculation method that underestimates peak flows compared with the county’s required methods.
Developer representatives and county planning staff told commissioners that roads and lot pads for phase 3 were already constructed and paved earlier this year. A developer representative said the phase was paved in January and that homes could begin construction once final approval was issued.
The engineer and commissioners agreed a path forward: the county engineer will provide a written roadway‑release/inspection letter and a separate letter describing the outstanding drainage issues and stating that phase 4 design will mitigate any measurable flow increases attributed to phase 3. The board approved the final plat contingent on receiving the engineer’s letter (expected midweek) and on explicit mitigation to be implemented in phase 4 if required.
Commissioners and staff emphasized public safety and adherence to adopted standards. Planning staff noted the county’s requirement of “no increase” in downstream peak discharge when evaluating subdivision drainage, and WSB framed its findings as a methodology and documentation concern that needs to be resolved before final, unconditional approval.
The board’s conditional approval is intended to allow the developer to proceed with building permits and lost‑lot activity while the documented drainage items are addressed in the next phase of construction and through the county engineer’s formal letters.
Votes: The motion to approve the final plat with the described contingencies passed unanimously on roll call.
What happens next: The county engineer will issue the requested letters; if the letters confirm that phase 4 design will mitigate the flow issues, planning staff will finalize the plat files and the developer may continue with building activity. If subsequent engineering work shows changes beyond mitigation via phase 4, the board retains authority to require additional corrective work.