US Bridges

Williams Br RD over Jefferson River 046

FairPosted for load

Gallatin County, Montana · 5M SW Willow Creek · Structure no. L16410002+03001

Built
1898
127 years old, rebuilt 1980
Condition
Fair
inspected June 2024
Type
Truss - Thru
Steel
Length
324 ft
2 main spans
Daily traffic
87
2023 count
Owner
County
County Highway Agency

About this bridge

Williams Br RD over Jefferson River 046 is a steel truss - thru carrying Williams Br RD over Jefferson River 046 in Gallatin County, Montana. It was built in 1898 and reconstructed in 1980, so it is 127 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. Its operating status is: posted for load restriction.

It carries about 87 vehicles a day, roughly 3% of them trucks, projected to reach 93 by 2043. The structure is 324 ft (98.7 m) long and 16 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesWilliams Br RD
CrossesJefferson River 046
Location5M SW Willow Creek
RouteCounty Highway 16410
CountyGallatin County
StateMontana
Coordinates45.80259, -111.69677
Functional classRural Major Collector

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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
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 rating8 US tons
Inventory rating7.1 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans2 (+2 approach)
Design loadUnknown
Structure length324 ft (98.7 m)
Longest span139 ft (42.4 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deck13 ft (3.8 m)

Traffic and service

Average daily traffic87 (2023)
Projected traffic93 by 2043
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$681,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Williams Br RD over Jefferson River 046 built?

It was built in 1898, making it 127 years old in 2025. It was reconstructed in 1980.

What condition is Williams Br RD over Jefferson River 046 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 June 2024.

How much traffic does Williams Br RD over Jefferson River 046 carry?

About 87 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Williams Br RD over Jefferson River 046?

The structure is 324 ft (98.7 m) long with a longest span of 139 ft (42.4 m) and a deck 16 ft wide.

Who owns Williams Br RD over Jefferson River 046?

It is owned by the County Highway Agency.