US Bridges

I 15 Ramp to Sp. M over Twain Ave

Good

Clark County, Nevada · Las Vegas · Structure no. H 804R

Built
1999
26 years old
Condition
Good
inspected January 2023
Type
Culvert
Concrete
Length
34 ft
1 main span
Daily traffic
26,100
2021 count
Owner
State
State Highway Agency

About this bridge

I 15 Ramp to Sp. M over Twain Ave is a concrete culvert carrying I 15 Ramp to Sp. M over Twain Ave in Clark County, Nevada. It was built in 1999, so it is 26 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 26,100 vehicles a day, projected to reach 333,000 by 2040. The structure is 34 ft (10.3 m) long and 44 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI 15 Ramp to Sp. M
CrossesTwain Ave
LocationLas Vegas
RouteInterstate 15
CountyClark County
StateNevada
Coordinates36.11977, -115.18021
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
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length34 ft (10.3 m)
Longest span34 ft (10.3 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,100 (2021)
Projected traffic333,000 by 2040
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 15 Ramp to Sp. M over Twain Ave built?

It was built in 1999, making it 26 years old in 2025.

What condition is I 15 Ramp to Sp. M over Twain Ave 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 2023.

How much traffic does I 15 Ramp to Sp. M over Twain Ave carry?

About 26,100 vehicles per day (2021 count).

How long is I 15 Ramp to Sp. M over Twain Ave?

The structure is 34 ft (10.3 m) long with a longest span of 34 ft (10.3 m) and a deck 44 ft wide.

Who owns I 15 Ramp to Sp. M over Twain Ave?

It is owned by the State Highway Agency.