US Bridges

W Reserve HWY over Big Muddy Creek

Fair

Sheridan County, Montana · E Edge Reserve · Structure no. S00258000+02001

Built
1949
76 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
151 ft
6 main spans
Daily traffic
151
2023 count
Owner
State
State Highway Agency

About this bridge

W Reserve HWY over Big Muddy Creek is a wood or timber stringer/multi-beam or girder carrying W Reserve HWY over Big Muddy Creek in Sheridan County, Montana. It was built in 1949, so it is 76 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 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 151 vehicles a day, roughly 20% of them trucks, projected to reach 159 by 2043. The structure is 151 ft (46 m) long and 26 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

CarriesW Reserve HWY
CrossesBig Muddy Creek
LocationE Edge Reserve
RouteState Highway 258
StateMontana
Coordinates48.60653, -104.45883
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionNovember 2023
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 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 rating41 US tons
Inventory rating29 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans6
Design loadH 15
Structure length151 ft (46 m)
Longest span25 ft (7.6 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic151 (2023)
Projected traffic159 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 W Reserve HWY over Big Muddy Creek built?

It was built in 1949, making it 76 years old in 2025.

What condition is W Reserve HWY over Big Muddy 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 November 2023.

How much traffic does W Reserve HWY over Big Muddy Creek carry?

About 151 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is W Reserve HWY over Big Muddy Creek?

The structure is 151 ft (46 m) long with a longest span of 25 ft (7.6 m) and a deck 26 ft wide.

Who owns W Reserve HWY over Big Muddy Creek?

It is owned by the State Highway Agency.