US Bridges

Hamilton Road over Smith Creek

FairPosted for load

Park County, Montana · 15M NE Wilsall · Structure no. L34991000+01001

Built
2012
13 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
25 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Hamilton Road over Smith Creek is a wood or timber stringer/multi-beam or girder carrying Hamilton Road over Smith Creek in Park County, Montana. It was built in 2012, so it is 13 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 25 ft (7.5 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesHamilton Road
CrossesSmith Creek
Location15M NE Wilsall
RouteCounty Highway 34991
StateMontana
Coordinates46.176, -110.5375
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating22 US tons
Inventory rating16 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length25 ft (7.5 m)
Longest span21 ft (6.5 m)
Deck width14 ft (4.3 m)
Roadway width10 ft (2.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Hamilton Road over Smith Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is Hamilton Road over Smith 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 August 2023.

How much traffic does Hamilton Road over Smith Creek carry?

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

How long is Hamilton Road over Smith Creek?

The structure is 25 ft (7.5 m) long with a longest span of 21 ft (6.5 m) and a deck 14 ft wide.

Who owns Hamilton Road over Smith Creek?

It is owned by the County Highway Agency.