US Bridges

Lake Rd-County RD over S Willow Creek

FairPosted for load

Madison County, Montana · Harrison · Structure no. 000000000007035

Built
1996
29 years old, rebuilt 2016
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
22 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Lake Rd-County RD over S Willow Creek is a wood or timber stringer/multi-beam or girder carrying Lake Rd-County RD over S Willow Creek in Madison County, Montana. It was built in 1996 and reconstructed in 2016, 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 22 ft (6.8 m) long and 26 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesLake Rd-County RD
CrossesS Willow Creek
LocationHarrison
RouteCity Street 29208
CountyMadison County
StateMontana
Coordinates45.70039, -111.78078
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.3 US tons
Inventory rating24.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length22 ft (6.8 m)
Longest span21 ft (6.5 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.2 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 closed2.5 mi (4 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 Lake Rd-County RD over S Willow Creek built?

It was built in 1996, making it 29 years old in 2025. It was reconstructed in 2016.

What condition is Lake Rd-County RD over S Willow 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 September 2024.

How much traffic does Lake Rd-County RD over S Willow Creek carry?

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

How long is Lake Rd-County RD over S Willow Creek?

The structure is 22 ft (6.8 m) long with a longest span of 21 ft (6.5 m) and a deck 26 ft wide.

Who owns Lake Rd-County RD over S Willow Creek?

It is owned by the County Highway Agency.