US Bridges

Fly Creek RD over Fly Creek 140

Fair

Yellowstone County, Montana · 1M SW Pompay`s Pillar · Structure no. L56124000+03001

Built
1996
29 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Prestressed Concrete
Length
83 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Fly Creek RD over Fly Creek 140 is a prestressed concrete tee beam carrying Fly Creek RD over Fly Creek 140 in Yellowstone County, Montana. It was built in 1996, so it is 29 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 83 ft (25.3 m) long and 33 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesFly Creek RD
CrossesFly Creek 140
Location1M SW Pompay`s Pillar
RouteCounty Highway 56124
StateMontana
Coordinates45.96598, -107.99565
Functional classRural Minor Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length83 ft (25.3 m)
Longest span83 ft (25.3 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Fly Creek RD over Fly Creek 140 built?

It was built in 1996, making it 29 years old in 2025.

What condition is Fly Creek RD over Fly Creek 140 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 April 2023.

How much traffic does Fly Creek RD over Fly Creek 140 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Fly Creek RD over Fly Creek 140?

The structure is 83 ft (25.3 m) long with a longest span of 83 ft (25.3 m) and a deck 33 ft wide.

Who owns Fly Creek RD over Fly Creek 140?

It is owned by the County Highway Agency.