Teton County commissioners continue detailed review of Northern South Park master site plan amid transit and housing disputes

Teton County commissioners on May 6 resumed a multi-hour review of MSC-2020-437, the master site plan application for Northern South Park Area 1, focusing on a revised park layout, adjustments to block density, and conditions tying transportation mitigation and construction management to future development plans.

The county’s senior planner, Chandler Windham, told commissioners the applicant submitted a new “alternative 4” park concept that keeps the overall number of housing units unchanged while shifting park footprints. Under that plan, Park 1 in the upper north corner would total 5 acres, Park 4 would be 3 acres and Park 5 would be roughly 2.1 acres; Block G is now shown entirely as parkland. Windham said parks and recreation prefers the alternative and that the applicant revised several block-level development standards to preserve density away from park parcels.

Why it matters: The master site plan establishes entitlement and a conceptual development framework intended to guide multiple future development-plan applications and public infrastructure decisions. Commissioners said the package must include clearer triggers and financial apportionment for off‑site transportation improvements, and more concrete plans to manage construction traffic and school‑period safety before later development phases proceed.

Most of the meeting’s debate centered on two timing questions: when the county should require final transportation mitigation and when construction-management measures addressing school‑period safety should be in place. Transportation staff and the county engineer urged a two-step approach: rely on the West Jackson Transportation Study and the master plan’s traffic analysis now, then require a more detailed “structured list” of contributions and monitoring before the first development plan is submitted. Several commissioners pushed for an earlier, clearer matrix tying specific unit triggers to improvements and cost shares; transportation manager Charlotte Frey and county engineer Amy Ramage said staff and the applicant can produce most of that matrix but need development‑plan detail to finalize construction‑period impacts.

The applicant and its counsel warned that many construction and design details cannot be finalized until a developer has a recorded entitlement for a block and has invested in a development plan. Amberlee Baker, speaking for the applicant, said: “We can’t get donors to the table. We can’t get lenders to the table until we have an entitlement.” She said requiring full engineering and construction plans before master‑plan recordation would delay the project and could prevent nonprofit developers from moving forward.

At the same time, several commissioners pressed for early protections for students and other pedestrians along High School Road. Commissioner Probst and others asked that any transportation condition explicitly require a construction management plan that (at a minimum) identifies alternate haul routes, off‑peak construction windows, and measures to keep trucks off High School Road during school arrival and dismissal. Frey recommended adding a specific bullet to staff’s draft condition addressing temporary on‑ and off‑site construction mitigations, and noted some intersections already operate at poor peak levels and will require long‑term upgrades as Area 1 grows.

Windham also summarized staff and applicant language on early conveyance of parkland: the applicant would convey remaining acreage of Park 1 within 30 days after the board approves a county plan that defines park improvements and funding; the applicant may substitute Park 4 or 5 for Park 1 if more suitable for early conveyance. That proposed amendment was discussed but not finalized.

Housing and phasing: Commissioners reviewed the housing element and a proposed condition intended to ensure that when unrestricted blocks are developed the companion restricted blocks remain feasible to build at the densities the master site plan assumes. Commissioner MacKerrall and others supported a condition requiring the applicant to demonstrate, prior to conveyance or concurrent with early development approvals, that a deed‑restricted block can support the number of units assumed in the master site plan or that an approved minor amendment process will resolve shortfalls.

Legal and process questions: County attorneys and planning staff noted statutory constraints in the LDRs (Teton County Land Development Regulations) on what can be required at the master‑plan stage versus what is reserved for development‑plan review. Chief Civil Deputy County Attorney Gingrey said master‑plan recording conveys entitlements and that many of the detailed, per‑block infrastructure and phasing decisions are typically resolved at development plan review. Commissioners must weigh whether to require more specificity before recording or accept further detail at the first development‑plan submittal.

Next steps and outstanding items: The board did not take a final vote. Staff will incorporate edits discussed in the meeting—particularly refining the transportation condition to include construction management language and a matrix of unit triggers and cost apportionment—and return to the board. The applicant said it will continue to coordinate with proposed housing partners about block phasing and feasibility. Commissioners asked staff to prepare clear condition language tying monitoring benchmarks and proportionate applicant contributions to off‑site improvements.

Ending: The commission paused deliberations to address other agenda items but left the master site plan open for follow‑up; no final action or recording was taken on MSC‑2020‑437 during the May 6 meeting.