US Bridges

Elk Creek RD over Shields River 018

PoorPosted for load

Park County, Montana · 3M NE Wilsall · Structure no. L34006000+07001

Built
1960
65 years old
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
63 ft
2 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Elk Creek RD over Shields River 018 is a steel stringer/multi-beam or girder carrying Elk Creek RD over Shields River 018 in Park County, Montana. It was built in 1960, so it is 65 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. 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 63 ft (19.2 m) long and 23 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesElk Creek RD
CrossesShields River 018
Location3M NE Wilsall
RouteCounty Highway 34006
StateMontana
Coordinates46.02594, -110.64096
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23 US tons
Inventory rating14 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans2
Design loadUnknown
Structure length63 ft (19.2 m)
Longest span30 ft (9.1 m)
Deck width23 ft (6.9 m)
Roadway width22 ft (6.6 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 closed11.8 mi (19 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$140,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Elk Creek RD over Shields River 018 built?

It was built in 1960, making it 65 years old in 2025.

What condition is Elk Creek RD over Shields River 018 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does Elk Creek RD over Shields River 018 carry?

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

How long is Elk Creek RD over Shields River 018?

The structure is 63 ft (19.2 m) long with a longest span of 30 ft (9.1 m) and a deck 23 ft wide.

Who owns Elk Creek RD over Shields River 018?

It is owned by the County Highway Agency.