Need a site plan or a stormwater design in Lewis and Clark County, MT? Lewis and Clark County has about 75,129 residents (2024 estimate) and 2 incorporated cities and towns. Describe your project once: licensed civil engineers who work in Lewis and Clark County get back to you.
Site plan review in Lewis and Clark County is handled by each city, or by the county in unincorporated areas.
Services available in Lewis and Clark County
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Site plan, grading and utilities
Civil site plan with grading, utilities and access, sealed by a licensed engineer for the permit.
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Stormwater and drainage design
Drainage calculations and stormwater management design required by the city, county or state.
Frequently asked questions in Lewis and Clark County
Do licensed civil engineers cover the whole of Lewis and Clark County?
Most pros work across the county and neighboring counties. Enter your ZIP code in the form and we match you with pros who serve your exact area.
Civil Engineering Site Plans in Montana: all counties
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.