US Bridges

US 89-MT 3-MT 200 over Missouri RIVER-U5205-RR

Fair

Cascade County, Montana · Great FALLS-10th Ave S · Structure no. P00060094+08282

Built
1951
74 years old
Condition
Fair
inspected August 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
2,092 ft
6 main spans
Daily traffic
13,666
2023 count
Owner
State
State Highway Agency

About this bridge

US 89-MT 3-MT 200 over Missouri RIVER-U5205-RR is a steel continuous girder and floorbeam system carrying US 89-MT 3-MT 200 over Missouri RIVER-U5205-RR in Cascade County, Montana. It was built in 1951, so it is 74 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 5 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 13,666 vehicles a day, roughly 2% of them trucks, projected to reach 14,349 by 2043. The structure is 2,092 ft (637.7 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 89-MT 3-MT 200
CrossesMissouri RIVER-U5205-RR
LocationGreat FALLS-10th Ave S
RouteU.S. Route 89
CountyCascade County
StateMontana
Coordinates47.49336, -111.31157
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating41 US tons
Inventory rating25 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6 (+21 approach)
Design loadHS 20
Structure length2,092 ft (637.7 m)
Longest span185 ft (56.4 m)
Deck width36 ft (10.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,666 (2023)
Projected traffic14,349 by 2043
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$6.7 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US 89-MT 3-MT 200 over Missouri RIVER-U5205-RR built?

It was built in 1951, making it 74 years old in 2025.

What condition is US 89-MT 3-MT 200 over Missouri RIVER-U5205-RR 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 August 2023.

How much traffic does US 89-MT 3-MT 200 over Missouri RIVER-U5205-RR carry?

About 13,666 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is US 89-MT 3-MT 200 over Missouri RIVER-U5205-RR?

The structure is 2,092 ft (637.7 m) long with a longest span of 185 ft (56.4 m) and a deck 36 ft wide.

Who owns US 89-MT 3-MT 200 over Missouri RIVER-U5205-RR?

It is owned by the State Highway Agency.