Visual Mitigation · Case study 01
I-11 / US 93 Hoover Dam Bypass — Tillman Memorial Bridge
- Client
- Hoover Dam Bypass Project (subcontract role)
- Location
- Nevada / Arizona state line
- Year
- Completed
- Category
- Visual Mitigation
Realignment of US 93 to connect to the Mike O'Callaghan–Pat Tillman Memorial Bridge, eliminating dangerous curves and steep grades. Sand Stone participated as a subcontractor.
- 3.5 miles of US 93 realignment
- Rock slope excavation and stabilization
- Desert tortoise habitat protection
- Environmental controls within Lake Mead National Recreation Area
Challenge
The realignment ran through steep rock terrain adjacent to Lake Mead National Recreation Area, with desert tortoise habitat requiring protection throughout construction.
Solution
Roadway realignment and slope work were sequenced with habitat protection measures and controls that minimized impact on the surrounding recreation area while removing dangerous curves and grades from the route.
Construction process
01
Environmental Protection
Desert tortoise habitat protection measures established before construction.
02
Excavation
Rock excavation and slope construction through steep canyon terrain.
03
Realignment
3.5 miles of US 93 realigned to connect to the new bridge.
04
Restoration
Disturbed areas treated and impacts to Lake Mead NRA minimized.
Results
- Roadway Realigned
- 3.5 miles
- Trade Route
- Restored
US 93 connection to the bridge.
Key NAFTA trade route restored and travel time between Arizona and Nevada reduced.
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