Oakport Township, now part of the city of Moorhead, Minn., is situated along the Red River and the Oakport Coulee. Oakport, along with most communities in the area, has been reacting to a cycle of rising flooding waters and the impacts for more than a decade. After the 1997 flood, Ulteig was retained to initiate a study to assess various possible solutions and recommend to the Township the most viable solution for resolution of flood-related impacts, based on 1997 river hydraulics. The findings of Ulteig’s study are summarized in a Flood Mitigation Plan Report.
In 2000, the project proceeded to a Phase I Environmental Study conducted by the USACE - St. Paul District office. In 2003, Ulteig began preparing preliminary design and additional river hydraulic analysis. Ulteig also conducted a benefit-cost analysis that met the USACE’s criteria. Ultimately, Oakport Township received sponsorship from the Buffalo-Red River Watershed District to design and construct the Oakport Flood Mitigation project to reduce future flood damage to 310 existing structures as well as future development in a 750-acre area of Oakport Township. The Oakport Flood Mitigation project is a 6-mile earthen levee system that includes five separate interior drainage systems, five 100-year regional stormwater retention basins, and five 5,000 gpm stormwater pumping stations.
This project also included the complete reconstruction and road raise of 3 miles of Clay County highways and the development, permitting, and construction of the wetland mitigation plan, which utilized a combination of on-site restoration and creation along with wetland banking to mitigate the project’s 10-acre wetland impact. Project design is based on the USACE standards to meet FEMA certification requirements.
Services provided by Ulteig include:
- HEC-RAS hydraulic modeling
- Engineer’s report (preliminary design and economic feasibility report)
- Environmental Assessment Worksheet (EAW)
- Earthen levee design (per USACE Design Standards)
- Flood control structures design
- Interior drainage and storage design
- Wetland mitigation plan and permitting
- Conditional Letter of Map Revisions (CLOMR)
- Coordination of geotechnical analysis
- Public hearings and public input meetings
- Topographic surveying
- Legal surveying (easement exhibits, certificate of surveys, and government corner certificates)
- Construction observation and staking
- Contract administration