Silver Bow County, MT zoning map, flood zone and property lines by address
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Towns in Silver Bow County: Butte, Butte-Silver Bow (Balance).
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA's countywide study for Silver Bow County has 58 FIRM panels, the newest effective June 2022; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Silver Bow house comes from a licensed surveyor and is often on file with the county or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Montana State Library, Montana Cadastral (MSDI), from Department of Revenue records, so a Silver Bow lot shows the same lines the Montana Department of Revenue draws. Silver Bow County covers about 459,514 acres of land and 371 acres of water.
Mapped lines are approximate. The Montana Department of Revenue keeps the parcel record (Silver Bow County website); a licensed surveyor sets the true corners.
Zoning
Silver Bow County zones its unincorporated land. ParcelSheet shows the use the Montana Department of Revenue lists for the lot and links the county planning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Montana's county zoning laws (Montana Code Annotated Title 76, Chapter 2, Parts 1 and 2), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Silver Bow lot can add one depends on its district; the county planning office has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. Silver Bow County is soil survey area MT670, Silver Bow County Area and Parts of Beaverhead and Jefferson Counties, Montana, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Silver Bow County needs a permit from the Silver Bow County sanitarian (local health department, under Montana DEQ standards).
Setbacks
Setbacks in Silver Bow County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county zoning office gives them for the lot's district.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Silver Bow lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Silver Bow County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's countywide flood map for Silver Bow County has 58 panels, the newest effective June 2022. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Silver Bow County?
Open the Montana map, type the address, and the parcel outline from the Montana Department of Revenue shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Silver Bow County?
Zoning in Silver Bow County is set by the county for unincorporated land and by each city inside its own limits. ParcelSheet shows the use code the Montana Department of Revenue lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Silver Bow County?
Under Montana's county zoning laws (Montana Code Annotated Title 76, Chapter 2, Parts 1 and 2), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Silver Bow County ask the zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in Silver Bow County?
Yes. A new or changed septic system in Silver Bow County needs a permit from the Silver Bow County sanitarian (local health department, under Montana DEQ standards). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area MT670 (Silver Bow County Area and Parts of Beaverhead and Jefferson Counties, Montana).
What can I build on 5 acres in Silver Bow County?
Zoning in Silver Bow County is set by the county for unincorporated land and each city inside its own limits. The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the planning office has the district and its rules. See the Silver Bow County website.
What are the residential setbacks in Silver Bow County (2026)?
Setbacks in Silver Bow County come from the zoning code of the county, or of the city when the lot is inside city limits: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the zoning office gives them for the district. See the Silver Bow County website.
Next to Silver Bow County: Beaverhead County, Deer Lodge County, Jefferson County, Madison County.
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