US Bridges

Sixteen Mile Road over Sixteen Mile Creek 070

Fair

Gallatin County, Montana · Maudlow · Structure no. L16235010+07001

Built
1974
51 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Sixteen Mile Road over Sixteen Mile Creek 070 is a prestressed concrete stringer/multi-beam or girder carrying Sixteen Mile Road over Sixteen Mile Creek 070 in Gallatin County, Montana. It was built in 1974, so it is 51 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 70 ft (21.3 m) long and 17 ft wide. If it were closed, the detour would be 75.2 mi (121 km).

CarriesSixteen Mile Road
CrossesSixteen Mile Creek 070
LocationMaudlow
RouteCounty Highway 16235
StateMontana
Coordinates46.10918, -111.16788
Functional classRural Local

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.
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating36 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span67 ft (20.4 m)
Deck width17 ft (5.3 m)
Roadway width16 ft (5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed75.2 mi (121 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$108,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Sixteen Mile Road over Sixteen Mile Creek 070 built?

It was built in 1974, making it 51 years old in 2025.

What condition is Sixteen Mile Road over Sixteen Mile Creek 070 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 September 2024.

How much traffic does Sixteen Mile Road over Sixteen Mile Creek 070 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Sixteen Mile Road over Sixteen Mile Creek 070?

The structure is 70 ft (21.3 m) long with a longest span of 67 ft (20.4 m) and a deck 17 ft wide.

Who owns Sixteen Mile Road over Sixteen Mile Creek 070?

It is owned by the County Highway Agency.