US Bridges

US 93 over Mud Creek

Fair

Lake County, Montana · 4M N Ronan · Structure no. P00005050+05081

Built
2008
17 years old
Condition
Fair
inspected January 2025
Type
Arch - Deck
Concrete
Length
52 ft
1 main span
Daily traffic
5,852
2023 count
Owner
State
State Highway Agency

About this bridge

US 93 over Mud Creek is a concrete arch - deck carrying US 93 over Mud Creek in Lake County, Montana. It was built in 2008, so it is 17 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 5,852 vehicles a day, roughly 3% of them trucks, projected to reach 6,144 by 2043. The structure is 52 ft (15.9 m) long and 39 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesUS 93
CrossesMud Creek
Location4M N Ronan
RouteU.S. Route 93
StateMontana
Coordinates47.58144, -114.11282
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85 US tons
Inventory rating66 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length52 ft (15.9 m)
Longest span41 ft (12.6 m)
Deck width39 ft (11.8 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,852 (2023)
Projected traffic6,144 by 2043
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 US 93 over Mud Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is US 93 over Mud 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 January 2025.

How much traffic does US 93 over Mud Creek carry?

About 5,852 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is US 93 over Mud Creek?

The structure is 52 ft (15.9 m) long with a longest span of 41 ft (12.6 m) and a deck 39 ft wide.

Who owns US 93 over Mud Creek?

It is owned by the State Highway Agency.