US Bridges

Yantic RD over Red Rock Coulee 004

FairPosted for load

Blaine County, Montana · 3M NE Lohman · Structure no. L03052002+02001

Built
1933
92 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
41 ft
1 main span
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

Yantic RD over Red Rock Coulee 004 is a steel stringer/multi-beam or girder carrying Yantic RD over Red Rock Coulee 004 in Blaine County, Montana. It was built in 1933, so it is 92 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. Its operating status is: posted for load restriction.

It carries about 40 vehicles a day, roughly 3% of them trucks, projected to reach 42 by 2043. The structure is 41 ft (12.5 m) long and 19 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesYantic RD
CrossesRed Rock Coulee 004
Location3M NE Lohman
RouteCounty Highway 3008
CountyBlaine County
StateMontana
Coordinates48.61817, -109.36817
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating18 US tons
Inventory rating11 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length41 ft (12.5 m)
Longest span40 ft (12.2 m)
Deck width19 ft (5.9 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic42 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$71,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Yantic RD over Red Rock Coulee 004 built?

It was built in 1933, making it 92 years old in 2025.

What condition is Yantic RD over Red Rock Coulee 004 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 February 2023.

How much traffic does Yantic RD over Red Rock Coulee 004 carry?

About 40 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Yantic RD over Red Rock Coulee 004?

The structure is 41 ft (12.5 m) long with a longest span of 40 ft (12.2 m) and a deck 19 ft wide.

Who owns Yantic RD over Red Rock Coulee 004?

It is owned by the County Highway Agency.