US Bridges

IRR - S 200 over Seepay Creek

Fair

Sanders County, Montana · 2M SW Perma · Structure no. P00006092+01681

Built
1969
56 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
31 ft
1 main span
Daily traffic
2,167
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 200 over Seepay Creek is a concrete slab carrying IRR - S 200 over Seepay Creek in Sanders County, Montana. It was built in 1969, so it is 56 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 2,167 vehicles a day, roughly 5% of them trucks, projected to reach 2,275 by 2043. The structure is 31 ft (9.4 m) long and 38 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesIRR - S 200
CrossesSeepay Creek
Location2M SW Perma
RouteState Highway 200
CountySanders County
StateMontana
Coordinates47.33825, -114.63745
Functional classRural Minor 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating41 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span28 ft (8.5 m)
Deck width38 ft (11.5 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,167 (2023)
Projected traffic2,275 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 200 over Seepay Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is IRR - S 200 over Seepay 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 May 2024.

How much traffic does IRR - S 200 over Seepay Creek carry?

About 2,167 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is IRR - S 200 over Seepay Creek?

The structure is 31 ft (9.4 m) long with a longest span of 28 ft (8.5 m) and a deck 38 ft wide.

Who owns IRR - S 200 over Seepay Creek?

It is owned by the State Highway Agency.