Bridge J0420 carries Route 19 over Spring Valley, just south of Round Spring. The bridge is almost 523 feet long carrying two traffic lanes on a 20-foot roadway. The current bridge condition ratings from the last available official inspection in October 2019 indicate the bridge is in satisfactory to poor condition.
The following alternatives were explored.
S-1
Description:
- New bridge on existing alignment.
- A grated two-lane temporary bridge will be built prior to construction of the new bridge and will be removed after the new bridge is constructed.
Advantages:
- Matches location of existing bridge.
- Less permanent roadway work.
- Avoids retaining walls or reinforced slopes.
Disadvantages:
- Additional cost for temporary bridge.
- Builds two bridges over the channel during construction.
- Extensive formwork in the channel.
- Longer construction period than new bridge on new alignment.
S-2
Description:
- New bridge upstream (northwest) of the existing bridge.
- No temporary bridge required.
Advantages:
- Shorter construction period than new bridge on existing alignment or rehabilitated bridge.
- No temporary bridge required; cost savings.
Disadvantages:
- More permanent roadway work.
- May need retaining walls or reinforced slopes.
S-3
Description:
- Single phase rehabilitation of the existing bridge.
- A grated two-lane temporary bridge will be built prior to the rehabilitation of the existing bridge and will be removed after the existing bridge is rehabilitated.
Advantages:
- Matches location of existing bridge.
- Less permanent roadway work.
- Avoids retaining walls or reinforced slopes.
Disadvantages:
- Additional cost for temporary bridge.
- Remediated concrete of the existing bridge is buried in the structure, possibly requiring further rehabilitation in the future.
- Shorter life expectancy compared to a new bridge.
- Extensive formwork in the channel.
No-Build Alternative
Cost: Variable depending on inspection results
Description:
- This alternative leaves the bridge in place. Routine maintenance of the bridge would continue, but no major rehabilitation would be done. Without a major rehabilitation or replacement project, the bridge would likely be closed in the next 10 years.
- This alternative is required to be carried forward in the environmental assessment process as a baseline for comparison purposes.
Advantages
- Little to no environmental concerns
Disadvantages
- High maintenance costs
- Doesn't meet current design standards
- The deck, substructure, and superstructure wouldn't be improved
- Shorter life span