US Bridges

East Post Creek RD over Post Creek 080

Good

Lake County, Montana · 5 MI N of ST Ignatius · Structure no. 000000202303300

Built
2022
3 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

East Post Creek RD over Post Creek 080 is a steel stringer/multi-beam or girder carrying East Post Creek RD over Post Creek 080 in Lake County, Montana. It was built in 2022, so it is 3 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 40 ft (12.3 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesEast Post Creek RD
CrossesPost Creek 080
Location5 MI N of ST Ignatius
RouteCounty Highway 24457
StateMontana
Coordinates47.39826, -114.08477
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating35.1 US tons
Inventory rating27 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length40 ft (12.3 m)
Longest span40 ft (12.2 m)
Deck width24 ft (7.3 m)
Roadway width21 ft (6.3 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 closed6.2 mi (10 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 East Post Creek RD over Post Creek 080 built?

It was built in 2022, making it 3 years old in 2025.

What condition is East Post Creek RD over Post Creek 080 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does East Post Creek RD over Post Creek 080 carry?

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

How long is East Post Creek RD over Post Creek 080?

The structure is 40 ft (12.3 m) long with a longest span of 40 ft (12.2 m) and a deck 24 ft wide.

Who owns East Post Creek RD over Post Creek 080?

It is owned by the County Highway Agency.