US Bridges

Fish Hatchery RD over E Fork Big Spring Creek

Fair

Fergus County, Montana · 4M SE Lewistown · Structure no. S00466000+02851

Built
1966
59 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
328
2023 count
Owner
State
State Highway Agency

About this bridge

Fish Hatchery RD over E Fork Big Spring Creek is a prestressed concrete stringer/multi-beam or girder carrying Fish Hatchery RD over E Fork Big Spring Creek in Fergus County, Montana. It was built in 1966, so it is 59 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 328 vehicles a day, projected to reach 344 by 2043. The structure is 76 ft (23.2 m) long and 28 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesFish Hatchery RD
CrossesE Fork Big Spring Creek
Location4M SE Lewistown
RouteState Highway 466
CountyFergus County
StateMontana
Coordinates47.02201, -109.36164
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.
Superstructure7 GoodSome minor problems.
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
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 rating52 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length76 ft (23.2 m)
Longest span75 ft (22.9 m)
Deck width28 ft (8.6 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic328 (2023)
Projected traffic344 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

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 Fish Hatchery RD over E Fork Big Spring Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is Fish Hatchery RD over E Fork Big Spring Creek 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 Fish Hatchery RD over E Fork Big Spring Creek carry?

About 328 vehicles per day (2023 count).

How long is Fish Hatchery RD over E Fork Big Spring Creek?

The structure is 76 ft (23.2 m) long with a longest span of 75 ft (22.9 m) and a deck 28 ft wide.

Who owns Fish Hatchery RD over E Fork Big Spring Creek?

It is owned by the State Highway Agency.