US Bridges

Hanover RD over Big Spring Creek

Fair

Fergus County, Montana · 8M NW Lewistown · Structure no. S00426020+04321

Built
1966
59 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
163 ft
3 main spans
Daily traffic
177
2023 count
Owner
State
State Highway Agency

About this bridge

Hanover RD over Big Spring Creek is a prestressed concrete stringer/multi-beam or girder carrying Hanover RD over 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 177 vehicles a day, roughly 4% of them trucks, projected to reach 186 by 2043. The structure is 163 ft (49.7 m) long and 32 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesHanover RD
CrossesBig Spring Creek
Location8M NW Lewistown
RouteState Highway 426
CountyFergus County
StateMontana
Coordinates47.12786, -109.57019
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length163 ft (49.7 m)
Longest span77 ft (23.5 m)
Deck width32 ft (9.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic177 (2023)
Projected traffic186 by 2043
Trucks4%
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 Hanover RD over Big Spring Creek built?

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

What condition is Hanover RD over 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 April 2023.

How much traffic does Hanover RD over Big Spring Creek carry?

About 177 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Hanover RD over Big Spring Creek?

The structure is 163 ft (49.7 m) long with a longest span of 77 ft (23.5 m) and a deck 32 ft wide.

Who owns Hanover RD over Big Spring Creek?

It is owned by the State Highway Agency.