US Bridges

S 19 over Mcdonald Creek

Good

Fergus County, Montana · 2M N Grass Range · Structure no. P00061045+08411

Built
1962
63 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
92 ft
2 main spans
Daily traffic
483
2023 count
Owner
State
State Highway Agency

About this bridge

S 19 over Mcdonald Creek is a prestressed concrete stringer/multi-beam or girder carrying S 19 over Mcdonald Creek in Fergus County, Montana. It was built in 1962, so it is 63 years old, older 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 483 vehicles a day, roughly 8% of them trucks, projected to reach 507 by 2043. The structure is 92 ft (28 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesS 19
CrossesMcdonald Creek
Location2M N Grass Range
RouteState Highway 19
CountyFergus County
StateMontana
Coordinates47.05046, -108.80447
Functional classRural Principal Arterial - Other

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 inspectionMay 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 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 rating58 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length92 ft (28 m)
Longest span46 ft (14 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic483 (2023)
Projected traffic507 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes

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 19 over Mcdonald Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is S 19 over Mcdonald 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 May 2023.

How much traffic does S 19 over Mcdonald Creek carry?

About 483 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is S 19 over Mcdonald Creek?

The structure is 92 ft (28 m) long with a longest span of 46 ft (14 m) and a deck 31 ft wide.

Who owns S 19 over Mcdonald Creek?

It is owned by the State Highway Agency.