US Bridges

SR-18 over Santa Clara River

Fair

Washington County, Utah · 0.4 Miles South of Veyo · Structure no. 0C 293

Built
1957
68 years old, rebuilt 2016
Condition
Fair
inspected January 2023
Type
Arch - Deck
Steel
Length
295 ft
1 main span
Daily traffic
3,996
2021 count
Owner
State
State Highway Agency

About this bridge

SR-18 over Santa Clara River is a steel arch - deck carrying SR-18 over Santa Clara River in Washington County, Utah. It was built in 1957 and reconstructed in 2016, so it is 68 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 3,996 vehicles a day, roughly 21% of them trucks, projected to reach 4,795 by 2041. The structure is 295 ft (89.9 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSR-18
CrossesSanta Clara River
Location0.4 Miles South of Veyo
RouteState Highway 18
CountyWashington County
StateUtah
Coordinates37.33151, -113.69326
Functional classRural Principal Arterial - Other

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.1 US tons
Inventory rating36.8 US tons

Structure

Structure typeArch - Deck
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20 + Mod
Structure length295 ft (89.9 m)
Longest span195 ft (59.4 m)
Deck width32 ft (9.7 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic3,996 (2021)
Projected traffic4,795 by 2041
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR-18 over Santa Clara River built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2016.

What condition is SR-18 over Santa Clara River 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 2023.

How much traffic does SR-18 over Santa Clara River carry?

About 3,996 vehicles per day (2021 count), of which roughly 21% are trucks.

How long is SR-18 over Santa Clara River?

The structure is 295 ft (89.9 m) long with a longest span of 195 ft (59.4 m) and a deck 32 ft wide.

Who owns SR-18 over Santa Clara River?

It is owned by the State Highway Agency.