US Bridges

Fdr 1649 over Boulder Creek

Fair

Idaho County, Idaho · Wilderness Gateway · Structure no. 010505000000050

Built
1968
57 years old
Condition
Fair
inspected August 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
124 ft
2 main spans
Daily traffic
30
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 1649 over Boulder Creek is a prestressed concrete stringer/multi-beam or girder carrying Fdr 1649 over Boulder Creek in Idaho County, Idaho. It was built in 1968, so it is 57 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 30 vehicles a day, projected to reach 45 by 2045. The structure is 124 ft (37.8 m) long and 32 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

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CarriesFdr 1649
CrossesBoulder Creek
LocationWilderness Gateway
RouteFederal Lands Road 1649
CountyIdaho County
StateIdaho
Coordinates46.34113, -115.31087
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating51.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length124 ft (37.8 m)
Longest span60 ft (18.3 m)
Deck width32 ft (9.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (—)
Projected traffic45 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 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 Fdr 1649 over Boulder Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is Fdr 1649 over Boulder 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 2022.

How much traffic does Fdr 1649 over Boulder Creek carry?

About 30 vehicles per day (latest count).

How long is Fdr 1649 over Boulder Creek?

The structure is 124 ft (37.8 m) long with a longest span of 60 ft (18.3 m) and a deck 32 ft wide.

Who owns Fdr 1649 over Boulder Creek?

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