US Bridges

I 15 over Boulder JCT Wash

Good

Clark County, Nevada · Las Vegas · Structure no. B 791

Built
1964
61 years old
Condition
Good
inspected January 2021
Type
Culvert
Concrete
Length
30 ft
2 main spans
Daily traffic
199,000
2021 count
Owner
State
State Highway Agency

About this bridge

I 15 over Boulder JCT Wash is a concrete culvert carrying I 15 over Boulder JCT Wash in Clark County, Nevada. It was built in 1964, so it is 61 years old, older 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 199,000 vehicles a day, roughly 21% of them trucks, projected to reach 384,670 by 2040. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI 15
CrossesBoulder JCT Wash
LocationLas Vegas
RouteInterstate 15
CountyClark County
StateNevada
Coordinates36.07819, -115.18069
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic199,000 (2021)
Projected traffic384,670 by 2040
Trucks21%
Lanes on structure16
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$450,000
NavigationNo navigation control on waterway

Frequently asked questions

When was I 15 over Boulder JCT Wash built?

It was built in 1964, making it 61 years old in 2025.

What condition is I 15 over Boulder JCT 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 2021.

How much traffic does I 15 over Boulder JCT Wash carry?

About 199,000 vehicles per day (2021 count), of which roughly 21% are trucks.

How long is I 15 over Boulder JCT Wash?

The structure is 30 ft (9.1 m) long with a longest span of 14 ft (4.3 m).

Who owns I 15 over Boulder JCT Wash?

It is owned by the State Highway Agency.