US Bridges

Forks RD over Stinky Creek 109

Fair

Phillips County, Montana · 10M NW Saco · Structure no. L36007021+07001

Built
1988
37 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
53 ft
3 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Forks RD over Stinky Creek 109 is a steel stringer/multi-beam or girder carrying Forks RD over Stinky Creek 109 in Phillips County, Montana. It was built in 1988, so it is 37 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.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 53 ft (16.3 m) long and 20 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

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CarriesForks RD
CrossesStinky Creek 109
Location10M NW Saco
RouteCounty Highway 36302
CountyPhillips County
StateMontana
Coordinates48.56259, -107.42132
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating25 US tons
Inventory rating19 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans3
Design loadHS 20
Structure length53 ft (16.3 m)
Longest span18 ft (5.5 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 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 closed39.8 mi (64 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 Forks RD over Stinky Creek 109 built?

It was built in 1988, making it 37 years old in 2025.

What condition is Forks RD over Stinky Creek 109 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 April 2024.

How much traffic does Forks RD over Stinky Creek 109 carry?

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

How long is Forks RD over Stinky Creek 109?

The structure is 53 ft (16.3 m) long with a longest span of 18 ft (5.5 m) and a deck 20 ft wide.

Who owns Forks RD over Stinky Creek 109?

It is owned by the County Highway Agency.