US Bridges

Logan ST SE over Antelope Creek 019

Fair

Wheatland County, Montana · SE Edge Harlowton · Structure no. L54011000+07001

Built
1931
94 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
39 ft
2 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Logan ST SE over Antelope Creek 019 is a wood or timber stringer/multi-beam or girder carrying Logan ST SE over Antelope Creek 019 in Wheatland County, Montana. It was built in 1931, so it is 94 years old, older 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 5 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 39 ft (11.9 m) long and 22 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesLogan ST SE
CrossesAntelope Creek 019
LocationSE Edge Harlowton
RouteCounty Highway 54018
CountyWheatland County
StateMontana
Coordinates46.43334, -109.81721
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length39 ft (11.9 m)
Longest span19 ft (5.8 m)
Deck width22 ft (6.7 m)
Roadway width21 ft (6.4 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 closed3.1 mi (5 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 Logan ST SE over Antelope Creek 019 built?

It was built in 1931, making it 94 years old in 2025.

What condition is Logan ST SE over Antelope Creek 019 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 September 2024.

How much traffic does Logan ST SE over Antelope Creek 019 carry?

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

How long is Logan ST SE over Antelope Creek 019?

The structure is 39 ft (11.9 m) long with a longest span of 19 ft (5.8 m) and a deck 22 ft wide.

Who owns Logan ST SE over Antelope Creek 019?

It is owned by the County Highway Agency.