US Bridges

Fish Hatchery RD over Big Spring Creek

Good

Fergus County, Montana · 5M SE Lewistown · Structure no. S00466001+04341

Built
1996
29 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
80 ft
1 main span
Daily traffic
328
2023 count
Owner
State
State Highway Agency

About this bridge

Fish Hatchery RD over Big Spring Creek is a prestressed concrete stringer/multi-beam or girder carrying Fish Hatchery RD over Big Spring Creek in Fergus County, Montana. It was built in 1996, so it is 29 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 328 vehicles a day, projected to reach 344 by 2043. The structure is 80 ft (24.3 m) long and 30 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesFish Hatchery RD
CrossesBig Spring Creek
Location5M SE Lewistown
RouteState Highway 466
CountyFergus County
StateMontana
Coordinates47.00814, -109.34988
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length80 ft (24.3 m)
Longest span76 ft (23.3 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 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 Big Spring Creek built?

It was built in 1996, making it 29 years old in 2025.

What condition is Fish Hatchery RD over Big Spring Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does Fish Hatchery RD over Big Spring Creek carry?

About 328 vehicles per day (2023 count).

How long is Fish Hatchery RD over Big Spring Creek?

The structure is 80 ft (24.3 m) long with a longest span of 76 ft (23.3 m) and a deck 30 ft wide.

Who owns Fish Hatchery RD over Big Spring Creek?

It is owned by the State Highway Agency.