US Bridges

Pine Creek Road over Grimes Creek

Fair

Boise County, Idaho · 9.5 MI S.W. of Id City · Structure no. 040203000001062

Built
1947
78 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
52 ft
1 main span
Daily traffic
25
1991 count
Owner
Federal
U.S. Forest Service

About this bridge

Pine Creek Road over Grimes Creek is a steel stringer/multi-beam or girder carrying Pine Creek Road over Grimes Creek in Boise County, Idaho. It was built in 1947, so it is 78 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 25 vehicles a day, projected to reach 37 by 2045. The structure is 52 ft (16 m) long and 16 ft wide. If it were closed, the detour would be 37.3 mi (60 km).

Location

Open in Google Maps
CarriesPine Creek Road
CrossesGrimes Creek
Location9.5 MI S.W. of Id City
RouteFederal Lands Road 366
CountyBoise County
StateIdaho
Coordinates43.76626, -115.97961
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation*: *
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating—
Inventory rating—

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20
Structure length52 ft (16 m)
Longest span50 ft (15.1 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (1991)
Projected traffic37 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.3 mi (60 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Pine Creek Road over Grimes Creek built?

It was built in 1947, making it 78 years old in 2025.

What condition is Pine Creek Road over Grimes Creek 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 August 2023.

How much traffic does Pine Creek Road over Grimes Creek carry?

About 25 vehicles per day (1991 count).

How long is Pine Creek Road over Grimes Creek?

The structure is 52 ft (16 m) long with a longest span of 50 ft (15.1 m) and a deck 16 ft wide.

Who owns Pine Creek Road over Grimes Creek?

It is owned by the U.S. Forest Service.