US Bridges

First St.South over I 84;FIRST ST South Gs

Fair

Payette County, Idaho · 22.8 W. Caldwell · Structure no. 000000000028455

Built
1960
65 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
300 ft
3 main spans
Daily traffic
540
2023 count
Owner
State
State Highway Agency

About this bridge

First St.South over I 84;FIRST ST South Gs is a prestressed concrete stringer/multi-beam or girder carrying First St.South over I 84;FIRST ST South Gs in Payette County, Idaho. It was built in 1960, so it is 65 years old, older than the Idaho average of 45.3 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 540 vehicles a day, roughly 10% of them trucks, projected to reach 810 by 2042. The structure is 300 ft (91.4 m) long and 29 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesFirst St.South
CrossesI 84;FIRST ST South Gs
Location22.8 W. Caldwell
RouteCounty Highway 0
StateIdaho
Coordinates43.96736, -116.90983
Functional classRural Minor 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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length300 ft (91.4 m)
Longest span71 ft (21.5 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic540 (2023)
Projected traffic810 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was First St.South over I 84;FIRST ST South Gs built?

It was built in 1960, making it 65 years old in 2025.

What condition is First St.South over I 84;FIRST ST South Gs 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 June 2024.

How much traffic does First St.South over I 84;FIRST ST South Gs carry?

About 540 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is First St.South over I 84;FIRST ST South Gs?

The structure is 300 ft (91.4 m) long with a longest span of 71 ft (21.5 m) and a deck 29 ft wide.

Who owns First St.South over I 84;FIRST ST South Gs?

It is owned by the State Highway Agency.