Flood Hazard Mapping Services

The government authority located in Washington is seeking a vendor to provide flood hazard mapping and related services to develop updated floodplain analyses for the Upper Snoqualmie basin. The agency is trying to solve the problem of outdated floodplain data by acquiring new aerial imagery and top bathymetric LiDAR to inform the study. The selected partner must manage the flood study project scope, schedule, and budget while conducting detailed field reconnaissance of the study area. The scope of work requires the vendor to assess the need for additional data collection and review existing LiDAR data and aerial imagery obtained from the County. The service provider must identify, survey, and provide horizontal and vertical coordinates for eight to ten photo-ID survey control points in existing imagery to check and adjust the new LiDAR data. Additionally, the project covers colorizing LiDAR if needed, performing ground and bathymetric surveys, and generating digital elevation models and topographic mapping. The chosen contractor must develop digital base maps showing topography and planimetric features like structures, roadways, boundaries of incorporated areas, highways, and major arterials. The agency requires the preparation of planimetric data sets, feature data, and breaklines based on the gathered survey and imagery. Finally, the vendor must perform hydrologic and hydraulic analyses for the drainage basins and delineate floodplain and FEMA floodway boundaries for the study area. Eligibility is restricted to onshore USA organizations only. The work will be performed through a combination of onsite and offsite tasks. The agency is looking for proposals to determine the budget, and bidders must submit their responses digitally via email or online. A pre-bid meeting is scheduled for July 1, 2026.