What are official floodplain maps called?
Federal Emergency Management Agency (FEMA) floodplain maps are known as Flood Insurance Rate Maps (FIRMs). Butte-Silver Bow has forty seven (47) FIRMs, including FIRMs for the Big Hole River. As each FIRM covers a large geographical area one FIRM may include the floodplain boundaries for more than one stream or river.

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1. What is a floodplain?
2. What are official floodplain maps called?
3. What is the purpose of floodplain mapping?
4. How are floodplains mapped?
5. How are floodplains (SFHA) illustrated on FIRMS?
6. How much of Butte-Silver Bow is regulated by FIRMS?
7. Did the recently adopted FIRMs change the SHFA boundaries if the 1980s FIRMs?
8. Where can I review a paper copy of a FIRM?
9. How are floodplains regulated in Butte-Silver Bow?
10. What kind of development is permitted in with the SHFA?
11. How do I apply for a floodplain development permit?