US Bridges

S 37 FH 57 over Cripple Horse Creek

Poor

Lincoln County, Montana · 6M NE Libby Dam · Structure no. P00033023+03421

Built
1974
51 years old
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
140 ft
3 main spans
Daily traffic
458
2023 count
Owner
State
State Highway Agency

About this bridge

S 37 FH 57 over Cripple Horse Creek is a prestressed concrete stringer/multi-beam or girder carrying S 37 FH 57 over Cripple Horse Creek in Lincoln County, Montana. It was built in 1974, so it is 51 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 458 vehicles a day, roughly 4% of them trucks, projected to reach 481 by 2043. The structure is 140 ft (42.7 m) long and 42 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesS 37 FH 57
CrossesCripple Horse Creek
Location6M NE Libby Dam
RouteState Highway 37
StateMontana
Coordinates48.47736, -115.25542
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span45 ft (13.7 m)
Deck width42 ft (12.7 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic458 (2023)
Projected traffic481 by 2043
Trucks4%
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 37 FH 57 over Cripple Horse Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is S 37 FH 57 over Cripple Horse Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does S 37 FH 57 over Cripple Horse Creek carry?

About 458 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is S 37 FH 57 over Cripple Horse Creek?

The structure is 140 ft (42.7 m) long with a longest span of 45 ft (13.7 m) and a deck 42 ft wide.

Who owns S 37 FH 57 over Cripple Horse Creek?

It is owned by the State Highway Agency.