College of Engineering Unit:
The client, Oregon Department of Transportation (ODOT), requested the replacement of a bridge over Clear Creek and road retrofit for a section of Highway 26 located northwest of Madras, OR. This bridge reached its viable lifespan and repair costs are too high; therefore, the bridge will be replaced with a culvert crossing. For the engineering team, the goal is to design an environmentally responsible crossing that protects the creek. To achieve this, one of the water resources engineers will design a culvert that provides fish passage, prevents scouring, and matches the existing stream bed material and slope. The other water resources engineer will implement a stormwater management system to ensure water quality and minimize runoff. The transportation group will focus on the client’s request to maintain two lanes of traffic during construction by building a temporary traffic crossing. Additionally, the transportation group will update the road design to meet AASHTO and ODOT requirements. Since soil capacity is important in maintaining traffic safety and the lifespan of the culvert, the geotechnical engineer will design for adequate bearing capacity, analyze the risk of landslides, and seismic activity.
For the final design, the water resources engineer chose a 12 ft by 24 ft reinforced concrete box culvert with a 3 ft cutoff wall, 3 ft headwall, 30-70 degree wingwalls, 3.6 ft streambed depth, and a 1% slope. The water resources engineer working on the stormwater management system designed a vegetated swale to be constructed on the southeast side of the culvert, and a vegetated filter strip on the southwest side. The transportation engineer working on traffic control chose the one lane, two-way taper method as a way to maintain two lanes of traffic movement during the construction period. The proposed realignment of US Highway 26 will consist of new compound curvature to replace the existing spiral curvature at approximately station 16+00 and end at approximately station 24+00. At the apex of the new alignment, station 21+00, the alignment will be moved approximately 11ft to the southeast. The new degree of curvature for the compound curve will be 2.75 degrees. The geotechnical engineer has designed and proposed two retainment structures. The upper US-26 retaining wall will be a geogrid reinforced embankment that protects against landslides and erosion. The lower Clear Creek retaining wall will be a rip rap and large boulder embankment which allows water flow without allowing scour or embankment erosion.
Project Communication Piece(s):
|Team CE.C3 Engineering Expo Poster||1.18 MB|