Slope & Swale Drainage

Missoula, MT

Commercial Detention, SWPPP & Parking Drainage in Missoula, MT

Organize commercial runoff, detention, parking-lot inlets, and construction sediment questions for the project team.

Commercial drainage is a secondary service at Slope & Swale Drainage. We review parking-lot flow, detention or retention areas, outfalls, inlet maintenance, construction access, and the sediment path from disturbed soil to a public drain or stream. We can organize field observations and questions for the civil engineer, licensed excavator, owner, or agency reviewer.

Missoula's 2026 stormwater program says city rules can require a Stormwater Permit for more than 2,500 square feet of land disturbance or a lot-grade change of 3 feet or more. Disturbance of one acre or more also requires coverage under Montana DEQ's construction stormwater permit. The project team must check the current thresholds, plans, inspections, and SWPPP duties. We do not stamp plans, issue permits, or promise approval.

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