US Bridges

S 200 over Landers Fork

Fair

Lewis and Clark County, Montana · 4M NE Lincoln · Structure no. P00024077+08071

Built
1938
87 years old, rebuilt 1988
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
154 ft
2 main spans
Daily traffic
2,011
2023 count
Owner
State
State Highway Agency

About this bridge

S 200 over Landers Fork is a steel continuous stringer/multi-beam or girder carrying S 200 over Landers Fork in Lewis and Clark County, Montana. It was built in 1938 and reconstructed in 1988, so it is 87 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 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 2,011 vehicles a day, roughly 7% of them trucks, projected to reach 2,112 by 2043. The structure is 154 ft (46.8 m) long and 42 ft wide. If it were closed, the detour would be 106.3 mi (171 km).

Location

Open in Google Maps
CarriesS 200
CrossesLanders Fork
Location4M NE Lincoln
RouteState Highway 200
CountyLewis and Clark County
StateMontana
Coordinates46.97751, -112.55606
Functional classRural Principal Arterial - Other

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 protection7 GoodSome minor problems.
Last inspectionJuly 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
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating34 US tons
Inventory rating26 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length154 ft (46.8 m)
Longest span75 ft (22.9 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,011 (2023)
Projected traffic2,112 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed106.3 mi (171 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 S 200 over Landers Fork built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1988.

What condition is S 200 over Landers Fork 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 July 2023.

How much traffic does S 200 over Landers Fork carry?

About 2,011 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is S 200 over Landers Fork?

The structure is 154 ft (46.8 m) long with a longest span of 75 ft (22.9 m) and a deck 42 ft wide.

Who owns S 200 over Landers Fork?

It is owned by the State Highway Agency.