US Bridges

Sollid RD over Sep Sollid Road-I 15

Fair

Pondera County, Montana · Conrad · Structure no. S00218000+05001

Built
1972
53 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
337 ft
4 main spans
Daily traffic
572
2023 count
Owner
State
State Highway Agency

About this bridge

Sollid RD over Sep Sollid Road-I 15 is a prestressed concrete stringer/multi-beam or girder carrying Sollid RD over Sep Sollid Road-I 15 in Pondera County, Montana. It was built in 1972, so it is 53 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 572 vehicles a day, roughly 4% of them trucks, projected to reach 601 by 2043. The structure is 337 ft (102.8 m) long and 46 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesSollid RD
CrossesSep Sollid Road-I 15
LocationConrad
RouteState Highway 218
CountyPondera County
StateMontana
Coordinates48.17384, -111.93297
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55 US tons
Inventory rating28 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length337 ft (102.8 m)
Longest span127 ft (38.7 m)
Deck width46 ft (14.1 m)
Roadway width44 ft (13.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic572 (2023)
Projected traffic601 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed11.8 mi (19 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sollid RD over Sep Sollid Road-I 15 built?

It was built in 1972, making it 53 years old in 2025.

What condition is Sollid RD over Sep Sollid Road-I 15 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 May 2023.

How much traffic does Sollid RD over Sep Sollid Road-I 15 carry?

About 572 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Sollid RD over Sep Sollid Road-I 15?

The structure is 337 ft (102.8 m) long with a longest span of 127 ft (38.7 m) and a deck 46 ft wide.

Who owns Sollid RD over Sep Sollid Road-I 15?

It is owned by the State Highway Agency.