US Bridges

Stp 7343;MAIN ST over Boise River Slough

Good

Ada County, Idaho · In Boise;main St.Wbl · Structure no. 000000000012770

Built
1965
60 years old, rebuilt 1991
Condition
Good
inspected February 2022
Type
Frame
Concrete
Length
26 ft
1 main span
Daily traffic
13,500
2023 count
Owner
County
County Highway Agency

About this bridge

Stp 7343;MAIN ST over Boise River Slough is a concrete frame carrying Stp 7343;MAIN ST over Boise River Slough in Ada County, Idaho. It was built in 1965 and reconstructed in 1991, so it is 60 years old, older than the Idaho average of 45.3 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 13,500 vehicles a day, roughly 5% of them trucks, projected to reach 20,250 by 2042. The structure is 26 ft (7.9 m) long and 160 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesStp 7343;MAIN ST
CrossesBoise River Slough
LocationIn Boise;main St.Wbl
RouteCounty Highway 7343
StateIdaho
Coordinates43.61969, -116.23283
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span26 ft (7.9 m)
Deck width160 ft (48.7 m)
Roadway width79 ft (24.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,500 (2023)
Projected traffic20,250 by 2042
Trucks5%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stp 7343;MAIN ST over Boise River Slough built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1991.

What condition is Stp 7343;MAIN ST over Boise River Slough 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 February 2022.

How much traffic does Stp 7343;MAIN ST over Boise River Slough carry?

About 13,500 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Stp 7343;MAIN ST over Boise River Slough?

The structure is 26 ft (7.9 m) long with a longest span of 26 ft (7.9 m) and a deck 160 ft wide.

Who owns Stp 7343;MAIN ST over Boise River Slough?

It is owned by the County Highway Agency.