Mohave County Flood Insurance Study Scope of Work
The Federal Emergency Management Agency (FEMA), in partnership with Mohave County and the incorporated communities, is conducting a study of flood hazards in several areas of the county, including Bullhead City, Kingman City, Colorado City, Lake Havasu City, and unincorporated areas of the county. The study will be used to update the Flood Insurance Rate Maps (FIRMs) for these communities, which were last updated at various times between December 22, 1981, and June 2, 1995. The new study will allow FEMA to republish the FIRM with more accurate flood hazard information.
Scope of the Study
In coordination with the local communities, FEMA has determined that the flood hazard study will be conducted for the following flooding sources:
Bullhead City
| Reach | Length (miles) |
|---|---|
| Davis Wash | 6.7 |
| Williams Wash | 3.1 |
| Highland Wash | 1.0 |
| Green Wash | 3.7 |
| Secret Canyon Pass | 4.2 |
| Dump Wash | 2.1 |
| Silver Creek Wash | 6.7 |
| Montana Wash | 5.4 |
| Big Montana Wash | 3.3 |
| Unnamed Tributary 4 | 1.8 |
| Chaparral Wash & Tributary | 2.3 |
| Fox Wash | 2.3 |
| Soto Wash & Tributary | 3.3 |
| Fort Mohave Wash | 2.0 |
| Bojorquez Wash | 4.9 |
Kingman City
| Reach | Length (miles) |
|---|---|
| Unnamed Washes 5-10 | 8.6 |
| Unnamed Wash 6 | 2.4 |
| Unnamed Wash 7 | 0.9 |
| Unnamed Wash 8 | 1.7 |
| Unnamed Wash 9 | 1.7 |
| Unnamed Wash 10 | 0.6 |
Colorado City
| Reach | Length (miles) |
|---|---|
| Short Creek and Tributaries | 2.5 |
| Unnamed Stream 11 | 2.1 |
Lake Havasu City
| Reach | Length (miles) |
|---|---|
| Neptune Wash | 2.3 |
| Havasupai Wash | 5.7 |
| El Dorado Wash | 4.9 |
| Indian Peak Wash | 5.2 |
| Chemehuevi Wash | 3.8 |
| Mockingbird Wash | 2.9 |
Mohave County
| Reach | Length (miles) |
|---|---|
Golden Valley |
|
| Thirteenmile Wash and Tributaries | 22.2 |
| Cerbat Wash and Tributary | 8.1 |
| Sacramento Wash | 5.3 |
Mohave Valley |
|
| Unnamed Streams 12 through 15 | 20.7 |
| Camp Mohave Wash | 2.7 |
Purpose of the Study
The primary purpose of the flood hazard study is to evaluate the effects of the flood having a 1 percent chance of occurrence in any given year. This event is also referred to as the base flood or 100-year flood. The expected height of the water during this flood is referred to as the Base Flood Elevation (BFE). Additionally, the study will result in the development of a floodway for each canyon. The floodway is the area of the floodplain that must be kept free of development so that floodwaters can be discharged and is the area in which the flood hazard is most severe.