US Bridges

York RD over Missouri River

Fair

Lewis and Clark County, Montana · 14M NE Helena · Structure no. S00280012+00001

Built
1982
43 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,080 ft
9 main spans
Daily traffic
551
2023 count
Owner
State
State Highway Agency

About this bridge

York RD over Missouri River is a prestressed concrete stringer/multi-beam or girder carrying York RD over Missouri River in Lewis and Clark County, Montana. It was built in 1982, so it is 43 years old, younger 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 551 vehicles a day, roughly 15% of them trucks, projected to reach 603 by 2043. The structure is 1,080 ft (329.1 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesYork RD
CrossesMissouri River
Location14M NE Helena
RouteState Highway 280
CountyLewis and Clark County
StateMontana
Coordinates46.71328, -111.80608
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 alignment6: Equal to present minimum criteria
Operating rating52 US tons
Inventory rating21.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length1,080 ft (329.1 m)
Longest span120 ft (36.6 m)
Deck width34 ft (10.5 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic551 (2023)
Projected traffic603 by 2043
Trucks15%
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

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 York RD over Missouri River built?

It was built in 1982, making it 43 years old in 2025.

What condition is York RD over Missouri River 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 December 2023.

How much traffic does York RD over Missouri River carry?

About 551 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is York RD over Missouri River?

The structure is 1,080 ft (329.1 m) long with a longest span of 120 ft (36.6 m) and a deck 34 ft wide.

Who owns York RD over Missouri River?

It is owned by the State Highway Agency.