US Bridges

Manchester RD S over Sun River 055

Good

Cascade County, Montana · Manchester · Structure no. L07502000+07001

Built
2001
24 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
282 ft
3 main spans
Daily traffic
244
2023 count
Owner
County
County Highway Agency

About this bridge

Manchester RD S over Sun River 055 is a steel continuous stringer/multi-beam or girder carrying Manchester RD S over Sun River 055 in Cascade County, Montana. It was built in 2001, so it is 24 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 244 vehicles a day, roughly 3% of them trucks, projected to reach 257 by 2043. The structure is 282 ft (86 m) long and 30 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesManchester RD S
CrossesSun River 055
LocationManchester
RouteCounty Highway 7502
StateMontana
Coordinates47.53671, -111.4582
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52 US tons
Inventory rating40 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length282 ft (86 m)
Longest span108 ft (33 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic244 (2023)
Projected traffic257 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 Manchester RD S over Sun River 055 built?

It was built in 2001, making it 24 years old in 2025.

What condition is Manchester RD S over Sun River 055 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 May 2023.

How much traffic does Manchester RD S over Sun River 055 carry?

About 244 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Manchester RD S over Sun River 055?

The structure is 282 ft (86 m) long with a longest span of 108 ft (33 m) and a deck 30 ft wide.

Who owns Manchester RD S over Sun River 055?

It is owned by the County Highway Agency.