100 North and Riverside Drive Bridge Rebuild and Road Realignment

Team: Ryan Allred, Landon Dunn, Payton Lee, Kade Meyer, Isaac Riggs, and Megan Wilson

Sponsor: Utah Department of Transportation

Project

RDR Engineering is a team of six civil and environmental engineers at Utah State University. The team has chosen to work with Logan City to redesign the bridge at 100 North and Riverside Drive in Logan, Utah. The current bridge:

  • Was built as a box culvert,
  • Has developed major scour concerns,
  • Does not meet the minimum elevation to pass a 100-year flood RDR Engineering designed a new bridge to replace the current bridge and will continue to allow access to the adjoining neighborhood during demolition and construction. The new bridge will have:
  • A widened substructure
  • Raised to meet to pass the 100-year flood.

Additionally, the connecting roadways were redesigned, vertically and horizontally, to connect the existing roadways to the redesigned bridge.

Figure 1. Current condition of girders and high water level

Figure 1. Current condition of girders and high water level

Alternatives

Figure 2. Bridge reconstruction

Figure 2. Bridge reconstruction

Figure 3. New roadway

Figure 3. New roadway

Figure 4. New bridge location (Sumac Drive)

Figure 4. New bridge location (Sumac Drive)

Figure 5. New bridge location (Island Drive)

Figure 5. New bridge location (Island Drive)

Figure 6. No build or river alteration

Figure 6. No build or river alteration

Roadway Design

The redesigned intersection of 100 North and Riverside Drive includes 517-foot and 658-foot roadway segments, respectively.

This design requires cut and fill procedures to align the bridge's updated elevation with the existing roadway elevation.

The roadway will have:

  • Four-foot sidewalks along 100 North facilitating pedestrian movement.
  • Straighter and more direct alignment for smoother and more efficient traffic flow.
  • Innovative design that aims to enhance safety and provide improved visibility for all users.
Figure 8. Horizontal alignment of new and existing roadway

Figure 8. Horizontal alignment of new and existing roadway

Design Criteria

Figure 7. Weighted criteria

Figure 7. Weighted criteria

Bridge Design

The new three lane bridge has the main objective to pass the 100-year flood. The redesigned bridge will be 60-feet long and 48-feet wide.

The bridge will have:

  • Sidewalks on bothsides with guardrails to encourage active transportation.
  • The abutment will be redesigned to meet the new loads and discourage scour.
  • Box girders to allow debris carried by the flood to slide underneath and to reduce the raise in elevation required.
Figure 9. Bridge typical section. Figure 10. Bridge plan view

Figure 10. Bridge plan view

Acknowledgements

RDR Engineering would like to thank Tom Roylance of UDOT (External Professional Engineer), Dr. Michelle Mekker (Faculty Advisor), Professor Autsin Ball, Lance Houser, and our client, Logan City, for their help and guidance on this project.