US Bridges

S 363 over Dodson South Canal

Fair

Phillips County, Montana · 1M SW Malta · Structure no. S00363011+03001

Built
1966
59 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
332
2023 count
Owner
State
State Highway Agency

About this bridge

S 363 over Dodson South Canal is a prestressed concrete stringer/multi-beam or girder carrying S 363 over Dodson South Canal in Phillips County, Montana. It was built in 1966, so it is 59 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 332 vehicles a day, roughly 1% of them trucks, projected to reach 349 by 2043. The structure is 76 ft (23.2 m) long and 35 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

CarriesS 363
CrossesDodson South Canal
Location1M SW Malta
RouteState Highway 363
StateMontana
Coordinates48.34017, -107.90089
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating23 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length76 ft (23.2 m)
Longest span75 ft (22.9 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic332 (2023)
Projected traffic349 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was S 363 over Dodson South Canal built?

It was built in 1966, making it 59 years old in 2025.

What condition is S 363 over Dodson South Canal 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 March 2024.

How much traffic does S 363 over Dodson South Canal carry?

About 332 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is S 363 over Dodson South Canal?

The structure is 76 ft (23.2 m) long with a longest span of 75 ft (22.9 m) and a deck 35 ft wide.

Who owns S 363 over Dodson South Canal?

It is owned by the State Highway Agency.