US Bridges

S Shiloh RD over Sep I 90

Poor

Yellowstone County, Montana · 2M SW Billings · Structure no. S00429002+02661

Built
1959
66 years old
Condition
Poor
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
457 ft
9 main spans
Daily traffic
3,188
2023 count
Owner
State
State Highway Agency

About this bridge

S Shiloh RD over Sep I 90 is a prestressed concrete stringer/multi-beam or girder carrying S Shiloh RD over Sep I 90 in Yellowstone County, Montana. It was built in 1959, so it is 66 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 3,188 vehicles a day, roughly 1% of them trucks, projected to reach 3,347 by 2043. The structure is 457 ft (139.3 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesS Shiloh RD
CrossesSep I 90
Location2M SW Billings
RouteCity Street 1031
CountyYellowstone County
StateMontana
Coordinates45.72568, -108.61752
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length457 ft (139.3 m)
Longest span62 ft (18.9 m)
Deck width32 ft (9.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,188 (2023)
Projected traffic3,347 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 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 S Shiloh RD over Sep I 90 built?

It was built in 1959, making it 66 years old in 2025.

What condition is S Shiloh RD over Sep I 90 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2023.

How much traffic does S Shiloh RD over Sep I 90 carry?

About 3,188 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is S Shiloh RD over Sep I 90?

The structure is 457 ft (139.3 m) long with a longest span of 62 ft (18.9 m) and a deck 32 ft wide.

Who owns S Shiloh RD over Sep I 90?

It is owned by the State Highway Agency.