US Bridges

Airport RD over Lone Tree Creek

Fair

Richland County, Montana · Sidney-Airport RD · Structure no. U10401000+04001

Built
1999
26 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete Continuous
Length
129 ft
3 main spans
Daily traffic
1,037
2023 count
Owner
County
County Highway Agency

About this bridge

Airport RD over Lone Tree Creek is a concrete continuous slab carrying Airport RD over Lone Tree Creek in Richland County, Montana. It was built in 1999, so it is 26 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 1,037 vehicles a day, roughly 2% of them trucks, projected to reach 1,146 by 2043. The structure is 129 ft (39.3 m) long and 34 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesAirport RD
CrossesLone Tree Creek
LocationSidney-Airport RD
RouteCounty Highway 42246
CountyRichland County
StateMontana
Coordinates47.71217, -104.18501
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating38 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length129 ft (39.3 m)
Longest span52 ft (16 m)
Deck width34 ft (10.3 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,037 (2023)
Projected traffic1,146 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Airport RD over Lone Tree Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is Airport RD over Lone Tree 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 October 2023.

How much traffic does Airport RD over Lone Tree Creek carry?

About 1,037 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Airport RD over Lone Tree Creek?

The structure is 129 ft (39.3 m) long with a longest span of 52 ft (16 m) and a deck 34 ft wide.

Who owns Airport RD over Lone Tree Creek?

It is owned by the County Highway Agency.