US Bridges

SR-64 Int.X-Rd. over I-15 (SR-15) Nbl & S

Fair

Millard County, Utah · South Holden Interchange · Structure no. 0P 15

Built
1976
49 years old
Condition
Fair
inspected February 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
308 ft
2 main spans
Daily traffic
961
2017 count
Owner
State
State Highway Agency

About this bridge

SR-64 Int.X-Rd. over I-15 (SR-15) Nbl & S is a concrete continuous box beam or girders - multiple carrying SR-64 Int.X-Rd. over I-15 (SR-15) Nbl & S in Millard County, Utah. It was built in 1976, so it is 49 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 6 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 961 vehicles a day, roughly 25% of them trucks, projected to reach 1,153 by 2037. The structure is 308 ft (93.9 m) long and 34 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSR-64 Int.X-Rd.
CrossesI-15 (SR-15) Nbl & S
LocationSouth Holden Interchange
RouteState Highway 64
CountyMillard County
StateUtah
Coordinates39.0824, -112.27609
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating58.2 US tons
Inventory rating28.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length308 ft (93.9 m)
Longest span154 ft (46.9 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic961 (2017)
Projected traffic1,153 by 2037
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

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 SR-64 Int.X-Rd. over I-15 (SR-15) Nbl & S built?

It was built in 1976, making it 49 years old in 2025.

What condition is SR-64 Int.X-Rd. over I-15 (SR-15) Nbl & S 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 February 2023.

How much traffic does SR-64 Int.X-Rd. over I-15 (SR-15) Nbl & S carry?

About 961 vehicles per day (2017 count), of which roughly 25% are trucks.

How long is SR-64 Int.X-Rd. over I-15 (SR-15) Nbl & S?

The structure is 308 ft (93.9 m) long with a longest span of 154 ft (46.9 m) and a deck 34 ft wide.

Who owns SR-64 Int.X-Rd. over I-15 (SR-15) Nbl & S?

It is owned by the State Highway Agency.