US Bridges

IRR - US 2 over Flatiron Creek

Fair

Glacier County, Montana · Blackfoot · Structure no. P00001229+04351

Built
1957
68 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
39 ft
2 main spans
Daily traffic
2,128
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - US 2 over Flatiron Creek is a wood or timber stringer/multi-beam or girder carrying IRR - US 2 over Flatiron Creek in Glacier County, Montana. It was built in 1957, so it is 68 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 2,128 vehicles a day, roughly 3% of them trucks, projected to reach 2,234 by 2043. The structure is 39 ft (11.9 m) long and 38 ft wide. If it were closed, the detour would be 80.8 mi (130 km).

Location

Open in Google Maps
CarriesIRR - US 2
CrossesFlatiron Creek
LocationBlackfoot
RouteU.S. Route 2
CountyGlacier County
StateMontana
Coordinates48.57453, -112.86807
Functional classRural Principal Arterial - Other

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 15
Structure length39 ft (11.9 m)
Longest span19 ft (5.8 m)
Deck width38 ft (11.6 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,128 (2023)
Projected traffic2,234 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed80.8 mi (130 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 IRR - US 2 over Flatiron Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is IRR - US 2 over Flatiron 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 2024.

How much traffic does IRR - US 2 over Flatiron Creek carry?

About 2,128 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is IRR - US 2 over Flatiron Creek?

The structure is 39 ft (11.9 m) long with a longest span of 19 ft (5.8 m) and a deck 38 ft wide.

Who owns IRR - US 2 over Flatiron Creek?

It is owned by the State Highway Agency.