US Bridges

HWY 10 over Keyser Creek

Fair

Stillwater County, Montana · 1M W Columbus · Structure no. S00306000+09691

Built
2004
21 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
100 ft
1 main span
Daily traffic
1,280
2023 count
Owner
State
State Highway Agency

About this bridge

HWY 10 over Keyser Creek is a prestressed concrete stringer/multi-beam or girder carrying HWY 10 over Keyser Creek in Stillwater County, Montana. It was built in 2004, so it is 21 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 1,280 vehicles a day, roughly 5% of them trucks, projected to reach 1,344 by 2043. The structure is 100 ft (30.5 m) long and 34 ft wide. If it were closed, the detour would be 23 mi (37 km).

Location

Open in Google Maps
CarriesHWY 10
CrossesKeyser Creek
Location1M W Columbus
RouteState Highway 306
CountyStillwater County
StateMontana
Coordinates45.64093, -109.27139
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length100 ft (30.5 m)
Longest span97 ft (29.5 m)
Deck width34 ft (10.3 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,280 (2023)
Projected traffic1,344 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 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 HWY 10 over Keyser Creek built?

It was built in 2004, making it 21 years old in 2025.

What condition is HWY 10 over Keyser 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 October 2024.

How much traffic does HWY 10 over Keyser Creek carry?

About 1,280 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is HWY 10 over Keyser Creek?

The structure is 100 ft (30.5 m) long with a longest span of 97 ft (29.5 m) and a deck 34 ft wide.

Who owns HWY 10 over Keyser Creek?

It is owned by the State Highway Agency.