US Bridges

Stp 7343;MAIN St. over US 20-26 Chinden Blvd

Fair

Ada County, Idaho · In Boise; Garden City Cl · Structure no. 000000000021452

Built
1991
34 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
161 ft
2 main spans
Daily traffic
13,500
2023 count
Owner
State
State Highway Agency

About this bridge

Stp 7343;MAIN St. over US 20-26 Chinden Blvd is a prestressed concrete continuous stringer/multi-beam or girder carrying Stp 7343;MAIN St. over US 20-26 Chinden Blvd in Ada County, Idaho. It was built in 1991, so it is 34 years old, younger 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 13,500 vehicles a day, roughly 5% of them trucks, projected to reach 20,250 by 2042. The structure is 161 ft (49.1 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesStp 7343;MAIN St.
CrossesUS 20-26 Chinden Blvd
LocationIn Boise; Garden City Cl
RouteCity Street 7343
CountyAda County
StateIdaho
Coordinates43.619, -116.23464
Functional classUrban Other Principal Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating49.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length161 ft (49.1 m)
Longest span85 ft (25.8 m)
Deck width55 ft (16.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,500 (2023)
Projected traffic20,250 by 2042
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 Stp 7343;MAIN St. over US 20-26 Chinden Blvd built?

It was built in 1991, making it 34 years old in 2025.

What condition is Stp 7343;MAIN St. over US 20-26 Chinden Blvd 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 2024.

How much traffic does Stp 7343;MAIN St. over US 20-26 Chinden Blvd carry?

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

How long is Stp 7343;MAIN St. over US 20-26 Chinden Blvd?

The structure is 161 ft (49.1 m) long with a longest span of 85 ft (25.8 m) and a deck 55 ft wide.

Who owns Stp 7343;MAIN St. over US 20-26 Chinden Blvd?

It is owned by the State Highway Agency.