100 West Bridge
600 S 100 W LOGAN, UTAH
Proposal Summary
Figure 1. Trailhead Engineering Team: Jordan Foraker, Annie Thacker, Kate Christiansen, Kyle Alger, Braxton Cook
Trailhead Engineering has designed a bridge to connect 100 W over the Logan River. The purpose of this project is to:
- Reduce travel times by making 100 W an alternative route to Main Street
- Improve safety by reducing congestion on Main Street
- Improve recreation by extending the current pedestrian trail
- Accommodate Cache Valley’s growing population
Alternatives
Alignment Alternatives
- East of church
- West of church
- Through church
Structural Alternatives
- Steel bridge
- Concrete bridge
- Box culvert
Criteria and Decision Matrices
Table 1. Alignment Decision Matrix
| Criteria | Weight | East Roadway | Weight | Through Church | Weight | No Build | Weight |
|---|---|---|---|---|---|---|---|
| Travel Time | 0.3 | 9 | 2.7 | 10 | 3 | 2 | 0.6 |
| Overall Cost | 0.1 | 7 | 0.7 | 2 | 0.2 | 10 | 1 |
| Environmental | 0.15 | 5 | 0.75 | 5 | 0.75 | 5 | 0.75 |
| Public Impact | 0.2 | 8 | 1.6 | 3 | 0.6 | 5 | 1 |
| Geometric Design | 0.25 | 7 | 1.75 | 5 | 1.25 | 5 | 1.25 |
| Total: | Total = | 7.5 | Total = | 5.8 | Total = | 4.6 | |
Table 2. Structural Decision Matrix
| Criteria | Weight | Steel Bridge | Weight | Box Culvert | Weight | Concrete Bridge | Weight | No Build | Weight |
|---|---|---|---|---|---|---|---|---|---|
| Overall Cost | 0.2 | 4 | 0.8 | 3 | 0.6 | 5 | 1 | 10 | 2 |
| Aesthetics | 0.35 | 2 | 0.7 | 4 | 1.4 | 6 | 2.1 | 3 | 1.05 |
| Environmental | 0.25 | 6 | 1.5 | 5 | 1.25 | 5 | 1.25 | 10 | 2.5 |
| Durability | 0.2 | 8 | 1.6 | 7 | 1.4 | 8 | 1.6 | 1 | 0.2 |
| Total: | Total = | 4.6 | Total = | 4.65 | Total = | 5.95 | Total = | 5.75 | |
Note: Higher values produce favorable alternatives in the decision matrix
Selected Alternatives
Based on the decision matrices and client needs, Trailhead Engineering decided on:
- East alignment to avoid disruption of the church property
- Concrete Bridge for aesthetics and durability
Figure 2. Similar bridge over the Logan River on 100 East
Figure 3. Aerial map view of the chosen alignment
Design
- 135’ long x 76’-5” wide
- 8” thick deck
- 4 travel lanes with a median lane
- Pedestrian sidewalks
Special Thanks
Professor Joey Laprevote, PE Utah State University
Professor Austin Ball, SE Utah State University
Sam Odd, PE Logan City
Sadie Boyer, EIT Logan City