US Bridges

Road 100 N over Sage Creek 022

FairPosted for load

Hill County, Montana · 10M N Hingham · Structure no. L21009004+09001

Built
1977
48 years old, rebuilt 2005
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
74 ft
1 main span
Daily traffic
81
2023 count
Owner
County
County Highway Agency

About this bridge

Road 100 N over Sage Creek 022 is a steel stringer/multi-beam or girder carrying Road 100 N over Sage Creek 022 in Hill County, Montana. It was built in 1977 and reconstructed in 2005, so it is 48 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. Its operating status is: posted for load restriction.

It carries about 81 vehicles a day, roughly 3% of them trucks, projected to reach 85 by 2043. The structure is 74 ft (22.6 m) long and 29 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesRoad 100 N
CrossesSage Creek 022
Location10M N Hingham
RouteCounty Highway 21009
CountyHill County
StateMontana
Coordinates48.71136, -110.399
Functional classRural Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28 US tons
Inventory rating18 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1 (+2 approach)
Design loadUnknown
Structure length74 ft (22.6 m)
Longest span30 ft (9 m)
Deck width29 ft (8.7 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81 (2023)
Projected traffic85 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road 100 N over Sage Creek 022 built?

It was built in 1977, making it 48 years old in 2025. It was reconstructed in 2005.

What condition is Road 100 N over Sage Creek 022 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 January 2024.

How much traffic does Road 100 N over Sage Creek 022 carry?

About 81 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Road 100 N over Sage Creek 022?

The structure is 74 ft (22.6 m) long with a longest span of 30 ft (9 m) and a deck 29 ft wide.

Who owns Road 100 N over Sage Creek 022?

It is owned by the County Highway Agency.