US Bridges

I-11SB over Wash

Good

Clark County, Nevada · Boulder Bypass · Structure no. B3177S

Built
2018
7 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
328 ft
2 main spans
Daily traffic
8,550
2021 count
Owner
State
State Highway Agency

About this bridge

I-11SB over Wash is a steel continuous stringer/multi-beam or girder carrying I-11SB over Wash in Clark County, Nevada. It was built in 2018, so it is 7 years old, younger than the Nevada average of 36.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,550 vehicles a day, roughly 3% of them trucks, projected to reach 43,000 by 2037. The structure is 328 ft (100.1 m) long and 49 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesI-11SB
CrossesWash
LocationBoulder Bypass
RouteInterstate 11
CountyClark County
StateNevada
Coordinates36.00076, -114.79675
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.3 US tons
Inventory rating59 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length328 ft (100.1 m)
Longest span162 ft (49.4 m)
Deck width49 ft (14.8 m)
Roadway width46 ft (13.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,550 (2021)
Projected traffic43,000 by 2037
Trucks3%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-11SB over Wash built?

It was built in 2018, making it 7 years old in 2025.

What condition is I-11SB over Wash in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2024.

How much traffic does I-11SB over Wash carry?

About 8,550 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is I-11SB over Wash?

The structure is 328 ft (100.1 m) long with a longest span of 162 ft (49.4 m) and a deck 49 ft wide.

Who owns I-11SB over Wash?

It is owned by the State Highway Agency.