US Bridges

Co. Rd. Int. X-Rd over I-15 (SR-15) NB and SB

Fair

Washington County, Utah · Snowfield Interchange · Structure no. 0D 636

Built
1959
66 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Concrete Continuous
Length
257 ft
4 main spans
Daily traffic
49
2012 count
Owner
State
State Highway Agency

About this bridge

Co. Rd. Int. X-Rd over I-15 (SR-15) NB and SB is a concrete continuous tee beam carrying Co. Rd. Int. X-Rd over I-15 (SR-15) NB and SB in Washington County, Utah. It was built in 1959, so it is 66 years old, older than the Utah average of 40.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 49 vehicles a day, roughly 13% of them trucks, projected to reach 61 by 2032. The structure is 257 ft (78.3 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesCo. Rd. Int. X-Rd
CrossesI-15 (SR-15) NB and SB
LocationSnowfield Interchange
RouteInterstate 15
CountyWashington County
StateUtah
Coordinates37.36163, -113.26232
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating71.4 US tons
Inventory rating67.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length257 ft (78.3 m)
Longest span73 ft (22.3 m)
Deck width30 ft (9.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic49 (2012)
Projected traffic61 by 2032
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes

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 Co. Rd. Int. X-Rd over I-15 (SR-15) NB and SB built?

It was built in 1959, making it 66 years old in 2025.

What condition is Co. Rd. Int. X-Rd over I-15 (SR-15) NB and SB in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2025.

How much traffic does Co. Rd. Int. X-Rd over I-15 (SR-15) NB and SB carry?

About 49 vehicles per day (2012 count), of which roughly 13% are trucks.

How long is Co. Rd. Int. X-Rd over I-15 (SR-15) NB and SB?

The structure is 257 ft (78.3 m) long with a longest span of 73 ft (22.3 m) and a deck 30 ft wide.

Who owns Co. Rd. Int. X-Rd over I-15 (SR-15) NB and SB?

It is owned by the State Highway Agency.