US Bridges

County Road 309 over Lone Tree Creek 033

Fair

Richland County, Montana · 1M SE Sidney · Structure no. L42309002+01001

Built
1993
32 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
261
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 309 over Lone Tree Creek 033 is a prestressed concrete tee beam carrying County Road 309 over Lone Tree Creek 033 in Richland County, Montana. It was built in 1993, so it is 32 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 261 vehicles a day, roughly 3% of them trucks, projected to reach 278 by 2043. The structure is 60 ft (18.3 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCounty Road 309
CrossesLone Tree Creek 033
Location1M SE Sidney
RouteCounty Highway 42309
CountyRichland County
StateMontana
Coordinates47.69575, -104.14181
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating47 US tons
Inventory rating32 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span58 ft (17.7 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic261 (2023)
Projected traffic278 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 County Road 309 over Lone Tree Creek 033 built?

It was built in 1993, making it 32 years old in 2025.

What condition is County Road 309 over Lone Tree Creek 033 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 County Road 309 over Lone Tree Creek 033 carry?

About 261 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is County Road 309 over Lone Tree Creek 033?

The structure is 60 ft (18.3 m) long with a longest span of 58 ft (17.7 m) and a deck 36 ft wide.

Who owns County Road 309 over Lone Tree Creek 033?

It is owned by the County Highway Agency.