US Bridges

Forest Road over Alder Creek

Good

Flathead County, Montana · Good Creek Road · Structure no. 011008000001070

Built
1983
42 years old
Condition
Good
inspected August 2022
Type
Tee Beam
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
50
1992 count
Owner
Federal
U.S. Forest Service

About this bridge

Forest Road over Alder Creek is a prestressed concrete tee beam carrying Forest Road over Alder Creek in Flathead County, Montana. It was built in 1983, so it is 42 years old, younger than the Montana average of 47 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 50 vehicles a day, projected to reach 75 by 2045. The structure is 45 ft (13.7 m) long and 17 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesForest Road
CrossesAlder Creek
LocationGood Creek Road
RouteFederal Lands Road 60
CountyFlathead County
StateMontana
Coordinates48.4674, -114.74747
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating36.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span44 ft (13.5 m)
Deck width17 ft (5.1 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (1992)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-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 Forest Road over Alder Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is Forest Road over Alder Creek 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 August 2022.

How much traffic does Forest Road over Alder Creek carry?

About 50 vehicles per day (1992 count).

How long is Forest Road over Alder Creek?

The structure is 45 ft (13.7 m) long with a longest span of 44 ft (13.5 m) and a deck 17 ft wide.

Who owns Forest Road over Alder Creek?

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