US Bridges

Agency Creek Road over Agency Creek (bridge 1)

Good

Lemhi County, Idaho · 0.5 E 0.5 S Tendoy · Structure no. 000000000034673

Built
2016
9 years old
Condition
Good
inspected April 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
33 ft
1 main span
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

Agency Creek Road over Agency Creek (bridge 1) is a steel stringer/multi-beam or girder carrying Agency Creek Road over Agency Creek (bridge 1) in Lemhi County, Idaho. It was built in 2016, so it is 9 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 30 vehicles a day, roughly 10% of them trucks, projected to reach 45 by 2039. The structure is 33 ft (10.1 m) long and 29 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesAgency Creek Road
CrossesAgency Creek (bridge 1)
Location0.5 E 0.5 S Tendoy
RouteCounty Highway 0
CountyLemhi County
StateIdaho
Coordinates44.9565, -113.63697
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50.4 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length33 ft (10.1 m)
Longest span32 ft (9.8 m)
Deck width29 ft (8.8 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 Agency Creek Road over Agency Creek (bridge 1) built?

It was built in 2016, making it 9 years old in 2025.

What condition is Agency Creek Road over Agency Creek (bridge 1) 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 April 2022.

How much traffic does Agency Creek Road over Agency Creek (bridge 1) carry?

About 30 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Agency Creek Road over Agency Creek (bridge 1)?

The structure is 33 ft (10.1 m) long with a longest span of 32 ft (9.8 m) and a deck 29 ft wide.

Who owns Agency Creek Road over Agency Creek (bridge 1)?

It is owned by the County Highway Agency.