US Bridges

S 83 FH 15 over Goat Creek

Fair

Lake County, Montana · 12M S Swan Lake · Structure no. P00083058+06641

Built
2004
21 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
69 ft
1 main span
Daily traffic
1,246
2023 count
Owner
State
State Highway Agency

About this bridge

S 83 FH 15 over Goat Creek is a prestressed concrete stringer/multi-beam or girder carrying S 83 FH 15 over Goat Creek in Lake County, Montana. It was built in 2004, so it is 21 years old, younger than the Montana average of 47 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 1,246 vehicles a day, roughly 6% of them trucks, projected to reach 1,308 by 2043. The structure is 69 ft (21 m) long and 42 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesS 83 FH 15
CrossesGoat Creek
Location12M S Swan Lake
RouteState Highway 83
StateMontana
Coordinates47.74928, -113.82348
Functional classRural Minor 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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating43 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length69 ft (21 m)
Longest span69 ft (21 m)
Deck width42 ft (12.7 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,246 (2023)
Projected traffic1,308 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S 83 FH 15 over Goat Creek built?

It was built in 2004, making it 21 years old in 2025.

What condition is S 83 FH 15 over Goat 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 2024.

How much traffic does S 83 FH 15 over Goat Creek carry?

About 1,246 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is S 83 FH 15 over Goat Creek?

The structure is 69 ft (21 m) long with a longest span of 69 ft (21 m) and a deck 42 ft wide.

Who owns S 83 FH 15 over Goat Creek?

It is owned by the State Highway Agency.