US Bridges

RD 7670 over Beatrice Creek

Fair

Sanders County, Montana · Beatrice CR · Structure no. 011608000000160

Built
1959
66 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
72 ft
2 main spans
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

RD 7670 over Beatrice Creek is a wood or timber stringer/multi-beam or girder carrying RD 7670 over Beatrice Creek in Sanders County, Montana. It was built in 1959, so it is 66 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 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 50 vehicles a day, projected to reach 75 by 2045. The structure is 72 ft (21.9 m) long and 16 ft wide.

CarriesRD 7670
CrossesBeatrice Creek
LocationBeatrice CR
RouteFederal Lands Road 7670
StateMontana
Coordinates47.79007, -115.10148
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating30.8 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length72 ft (21.9 m)
Longest span35 ft (10.8 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was RD 7670 over Beatrice Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is RD 7670 over Beatrice 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 July 2023.

How much traffic does RD 7670 over Beatrice Creek carry?

About 50 vehicles per day (latest count).

How long is RD 7670 over Beatrice Creek?

The structure is 72 ft (21.9 m) long with a longest span of 35 ft (10.8 m) and a deck 16 ft wide.

Who owns RD 7670 over Beatrice Creek?

It is owned by the U.S. Forest Service.