Chaffee County presents habitat-connectivity rules, maps and mitigation tools to reduce vehicle–wildlife collisions

Planning staff presented Chaffee County's existing land-use code standards and a county 'Planning for Wildlife' map intended to identify high-quality wildlife habitat, migration corridors and big-game winter range and to guide development away from those areas.

The presentation opened with a county planner saying the code requires use of the Planning for Wildlife map to "identify locations of sensitive wildlife habitats" and that "impacts to high and highest quality habitats be avoided if possible." The planner said the county's map was developed with partners including Colorado Parks and Wildlife, the U.S. Forest Service and the Bureau of Land Management and will be applied during development review.

The planning staff emphasized why the rules matter: vehicle'wildlife collisions have a high human and economic cost, and the county contains multiple state-identified hot spots. The presenter cited state and federal analyses, saying, "vehicle wildlife collisions account for over 2,000,000 annual collisions per year" and that Colorado Parks and Wildlife calculates a measurable toll on collared mule deer. The presenter said CDOT and CPW prioritization studies show segments of state highway in Chaffee County ranking in the top 5% of Western Slope collision-priority stretches; the county contains six such segments, including areas west of Poncha Springs, sections north of Buena Vista and corridors along Trout Creek.

Chaffee County's land-use code already layers requirements for development in mapped resource stewardship areas. The planner described options required by the code: avoid siting development in mapped habitat when feasible; when avoidance is not possible, minimize impacts and apply mitigation. For higher-quality habitat, the code calls for conservation subdivision design and a protected open-space requirement equivalent to about two-thirds of the parcel preserved in perpetuity. The planner explained the density trade-off: standard agricultural/ranching density is roughly one dwelling unit per 35 acres, and the code offers a fourfold density bonus for projects that use the conservation-subdivision approach.

The code also sets siting and road-design expectations. For example, the planner said developments in high- and highest-quality habitat must provide setbacks ("at least 100 feet from the habitat boundary, or 300 feet from a river or stream that is in the higher highest quality habitat") and that road impacts "shall be minimized and mitigated using contextually appropriate design techniques to provide for the safe passage of wildlife." Examples provided included narrowed road widths, reduced design speeds, traffic calming, fencing tied to passage structures, oversized culverts and periodic or seasonal closures.

The presenter showed case studies from other Colorado corridors, including the two overpasses and multiple underpasses north of Kremmling where road mortality declined significantly after construction; the presenter noted mortality concentrated where fencing ends. The slide deck described lower-cost options that scale down from multi-million-dollar overpasses, such as oversized culverts with low-flow shelves and fenced at-grade crossings for smaller species.

Planning staff said the county is pursuing project-level work and grant funding partnerships, and that some major state and federal grants have already supported fencing and underpasses elsewhere in Colorado. The presenter said the county will include a design manual and guidance for applicants so developers and road designers know what structures and siting strategies are most appropriate for different species and settings.

The presentation concluded with staff noting the item is scheduled for discussion at the Planning Commission in the upcoming week and that the county will continue coordinating with CDOT and CPW on corridor priorities and funding opportunities.

Ending: The presenter said the county code frames habitat protection as a tool to reduce collisions and protect livelihoods and tourism value, and staff urged early coordination between developers and county planners so simple site changes can avoid more costly mitigation later.