Planning commission recommends county adopt new grading, excavation and driveway standards

SAN MIGUEL COUNTY, Colo. — The San Miguel County Planning Commission voted Dec. 12 to recommend that the County Commissioners adopt a set of land use code amendments establishing a new Excavation and Grading section (5-713) and revising countywide driveway standards (section 5-502 DD).

The commission’s recommendation, made during the Dec. 12 meeting and forwarded to the Board of County Commissioners, would require a grading permit for excavation, grading or placement of fill in excess of 50 cubic yards (with the draft defining how those volumes are to be calculated) and would lower the engineering threshold for larger projects to disturbances of 1,000 cubic yards. The draft also sets design and submittal standards — including vegetation and weed-control plans, bonding for projects larger than one acre, and record letters sealed by a licensed engineer where required.

Why it matters: the changes are intended to give county staff clearer, objective standards to address cases of unpermitted site alteration, to reduce erosion and sedimentation risks, and to provide a consistent basis for requiring professional engineering review where site conditions pose greater risk to life, safety or neighboring properties.

Planning staff told the commission the amendment was drafted after internal review, consultation with a local professional engineer and referral agency comments. The draft exempts routine agricultural activities, wells, on-site wastewater systems, utility trenching, work associated with valid building permits, and government right-of-way and road/bridge work from the grading-permit requirement, but otherwise applies countywide with some zone-district exceptions noted in the draft (for example, the West End and High Country zone districts were not meant to be subject to the countywide driveway standards in this version).

County building official Matt Gonzales urged a lower threshold for when engineering is required. "We're seeing new levels of creativity with projects, and I think we're at a point in our history where we need to start really scrutinizing some of these proposed designs with engineering," Gonzales said. He argued clearer engineering triggers would help staff apply standards consistently rather than making subjective calls in the field.

Commissioner Allie pressed a safety rationale for engineering requirements: "Engineers exist to protect life and safety," she said, urging that the rule not be carved out by geography or solely by cost concerns. Planning staff and the county’s consulting engineer, who provided technical comments on the draft, said the proposal folded many of those referral suggestions into the current draft while keeping discretion for staff to request outside review when unusual site conditions dictate.

Key technical thresholds and requirements discussed by the commission and staff included: a 50-cubic-yard permit trigger (with a required clarification in the draft about how to count cut and fill volumes), a 1,000-cubic-yard threshold for mandatory engineering and bonding for projects over one acre; requiring engineering for cuts greater than 3 feet, slopes steeper than 3:1, retaining walls taller than 4 feet, or where geohazards are present; a minimum 5-foot setback of grading features from property lines; and driveway-specific engineering triggers for grades of 6% or higher, transitional grades of 8% or higher, or driveways longer than 500 feet. The draft also requires emergency access provisions and minimum widths for driveways.

The draft clarifies that grading cannot change historic flow patterns of stormwater and surface runoff onto or off of a property, a point commissioners debated to ensure residents could make reasonable on-site adjustments (for example to protect a home) while not routing water to neighboring properties.

Referral agency comments led to several clarifications in the draft. The county’s outside engineer recommended additional design review for rights-of-way and other higher-risk conditions; the Norwood Fire Protection District requested that language about fire-suppression ponds be included (staff said such ponds are rare and typically subject to additional county-commission oversight); and tribal consultation language was discussed after commissioners raised that state law requires consultation for renewable-energy projects, prompting staff to add the Southern Ute and Ute Mountain Ute tribes to the referral list.

Outcome and next steps: After discussion and minor edits requested at the hearing, the commission voted to recommend the Board of County Commissioners adopt the amendments with the exceptions and clarifications noted by the planning director at the meeting. Commissioner Galena recused herself from the vote. Staff said the code will likely be adjusted further after implementation experience and that the amendments will be accompanied by outreach (including a potential press release and updates when the county’s online code is published). The Board of County Commissioners will consider the recommendation in a future meeting.

Votes at a glance: The Planning Commission moved and seconded a recommendation to the Board of County Commissioners to adopt the amendments as presented with manager/Director-noted edits; the motion passed and was forwarded to the BOCC. Galena recused from the vote.

Local context: Commissioners noted the county’s varied geography — from Wrights Mesa and agricultural areas to steeper valley slopes and Telluride-area lots — and discussed how the thresholds and exemptions balance equity for rural property owners with protections for neighbors and infrastructure. Staff said the county can require engineering outside the explicit thresholds if a particular site raises safety or stability concerns, and that the county may return to the commission to refine the code after experience with the new standards.

Staff and public materials for the amendment included a staff memo, draft amendment language, meeting notice and referral comments; no written public comments on the draft had been received at the time of the Dec. 12 meeting.