US Bridges

Shonkin RD over Shonkin Creek 017

Fair

Chouteau County, Montana · 1M W Shonkin · Structure no. L08201008+05001

Built
2011
14 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
53 ft
1 main span
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

Shonkin RD over Shonkin Creek 017 is a steel stringer/multi-beam or girder carrying Shonkin RD over Shonkin Creek 017 in Chouteau County, Montana. It was built in 2011, so it is 14 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 40 vehicles a day, roughly 3% of them trucks, projected to reach 42 by 2043. The structure is 53 ft (16.3 m) long and 20 ft wide. If it were closed, the detour would be 41 mi (66 km).

Location

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CarriesShonkin RD
CrossesShonkin Creek 017
Location1M W Shonkin
RouteCounty Highway 8201
CountyChouteau County
StateMontana
Coordinates47.62638, -110.58187
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length53 ft (16.3 m)
Longest span49 ft (14.9 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic42 by 2043
Trucks3%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed41 mi (66 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 Shonkin RD over Shonkin Creek 017 built?

It was built in 2011, making it 14 years old in 2025.

What condition is Shonkin RD over Shonkin Creek 017 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 Shonkin RD over Shonkin Creek 017 carry?

About 40 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Shonkin RD over Shonkin Creek 017?

The structure is 53 ft (16.3 m) long with a longest span of 49 ft (14.9 m) and a deck 20 ft wide.

Who owns Shonkin RD over Shonkin Creek 017?

It is owned by the County Highway Agency.