US Bridges

IRR - S 212 over Mission Creek

Fair

Lake County, Montana · Moiese · Structure no. S00212005+00991

Built
1959
66 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
75 ft
3 main spans
Daily traffic
922
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 212 over Mission Creek is a wood or timber stringer/multi-beam or girder carrying IRR - S 212 over Mission Creek in Lake County, Montana. It was built in 1959, so it is 66 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 922 vehicles a day, roughly 3% of them trucks, projected to reach 968 by 2043. The structure is 75 ft (22.9 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesIRR - S 212
CrossesMission Creek
LocationMoiese
RouteState Highway 212
CountyLake County
StateMontana
Coordinates47.3735, -114.26161
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating48 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 15
Structure length75 ft (22.9 m)
Longest span25 ft (7.6 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic922 (2023)
Projected traffic968 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 IRR - S 212 over Mission Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is IRR - S 212 over Mission Creek 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 2023.

How much traffic does IRR - S 212 over Mission Creek carry?

About 922 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is IRR - S 212 over Mission Creek?

The structure is 75 ft (22.9 m) long with a longest span of 25 ft (7.6 m) and a deck 30 ft wide.

Who owns IRR - S 212 over Mission Creek?

It is owned by the State Highway Agency.