US Bridges

US 287 over Dry Creek

Good

Lewis and Clark County, Montana · 5M SE Augusta · Structure no. P00009032+06901

Built
2008
17 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
69 ft
1 main span
Daily traffic
377
2023 count
Owner
State
State Highway Agency

About this bridge

US 287 over Dry Creek is a steel stringer/multi-beam or girder carrying US 287 over Dry Creek in Lewis and Clark 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 377 vehicles a day, roughly 7% of them trucks, projected to reach 396 by 2043. The structure is 69 ft (21 m) long and 38 ft wide. If it were closed, the detour would be 60.9 mi (98 km).

CarriesUS 287
CrossesDry Creek
Location5M SE Augusta
RouteU.S. Route 287
StateMontana
Coordinates47.41753, -112.33535
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating44 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length69 ft (21 m)
Longest span66 ft (20 m)
Deck width38 ft (11.5 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic377 (2023)
Projected traffic396 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.9 mi (98 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 US 287 over Dry Creek built?

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

What condition is US 287 over Dry Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does US 287 over Dry Creek carry?

About 377 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 287 over Dry Creek?

The structure is 69 ft (21 m) long with a longest span of 66 ft (20 m) and a deck 38 ft wide.

Who owns US 287 over Dry Creek?

It is owned by the State Highway Agency.