Ames, Iowa

Dotson Drive Extension

  • Client Ames Community School District
  • Type Stormwater
  • Services Evaluation, Design, Construction Administration
  • Project Manager John Gade, P.E.


The Ames Community School District facilities at Dotson Drive and Mortenson Road did not have a roadway connection across College Creek to the north.  An extension across the creek was needed to reduce traffic problems and to allow access to the school’s facilities on the north side of College Creek.

The proposed roadway extension across College creek included a new roadway that required a hydraulic analysis of the proposed road crossing to be completed to verify performance of the proposed twin 8’x8’ box culverts. In addition, it was necessary to verify that design requirements were being incorporated into the design to allow permitting of the project to be completed.

As this area of College Creek is in a detailed study area as identified by the Federal Emergency Management Agency (FEMA), any grading within the floodplain required permitting through the Iowa Department of Natural Resources (IDNR) floodplain department for verify federal requirements were being accomplished with the design.  As the roadway included extensive fill to allow the box culvert and roadway installation, hydraulic analysis was necessary to verify that the proposed improvements would not negatively alter the floodplain and affect nearby properties.


FOX Engineering completed a hydraulic analysis of the box culverts to verify capacity and produce the required documentation to obtain a floodplain permit from the IDNR. This included a comprehensive analysis of the box culvert design, and other improvements for the roadway crossing, that meet the requirements of FEMA. This timely analysis allowed for development plans to be completed and improvements to be installed prior to the next school year.


This connection allows for improved traffic conditions during school events and activities. In addition, the roadway allows the school to have vehicular traffic access to its recreational facilities north of College Creek.