US Bridges

Glaston RD over Otter Creek

Good

Sweet Grass County, Montana · 7M SE Melville · Structure no. 000000000007019

Built
2013
12 years old
Condition
Good
inspected June 2023
Type
Tee Beam
Prestressed Concrete
Length
47 ft
1 main span
Daily traffic
73
2023 count
Owner
County
County Highway Agency

About this bridge

Glaston RD over Otter Creek is a prestressed concrete tee beam carrying Glaston RD over Otter Creek in Sweet Grass County, Montana. It was built in 2013, so it is 12 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 73 vehicles a day, roughly 29% of them trucks, projected to reach 77 by 2043. The structure is 47 ft (14.4 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesGlaston RD
CrossesOtter Creek
Location7M SE Melville
RouteCounty Highway 49007
StateMontana
Coordinates46.0053, -109.88613
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52 US tons
Inventory rating37 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length47 ft (14.4 m)
Longest span42 ft (12.8 m)
Deck width26 ft (8 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic73 (2023)
Projected traffic77 by 2043
Trucks29%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Glaston RD over Otter Creek built?

It was built in 2013, making it 12 years old in 2025.

What condition is Glaston RD over Otter Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Glaston RD over Otter Creek carry?

About 73 vehicles per day (2023 count), of which roughly 29% are trucks.

How long is Glaston RD over Otter Creek?

The structure is 47 ft (14.4 m) long with a longest span of 42 ft (12.8 m) and a deck 26 ft wide.

Who owns Glaston RD over Otter Creek?

It is owned by the County Highway Agency.