US Bridges

County RD 949 over Cobleigh Rd.Big Butte CR

GoodPosted for load

Jackson County, Oregon · 2.01 Milepost · Structure no. 29C237949 00201

Built
1954
71 years old
Condition
Good
inspected July 2023
Type
Truss - Thru
Steel
Length
303 ft
1 main span
Daily traffic
380
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 949 over Cobleigh Rd.Big Butte CR is a steel truss - thru carrying County RD 949 over Cobleigh Rd.Big Butte CR in Jackson County, Oregon. It was built in 1954, so it is 71 years old, older than the Oregon average of 49.9 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. Its operating status is: posted for load restriction.

It carries about 380 vehicles a day, roughly 3% of them trucks, projected to reach 442 by 2025. The structure is 303 ft (92.4 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesCounty RD 949
CrossesCobleigh Rd.Big Butte CR
Location2.01 Milepost
RouteCounty Highway C0949
CountyJackson County
StateOregon
Coordinates42.58114, -122.60236
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating21.4 US tons
Inventory rating16.8 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckOpen grating
Main spans1 (+2 approach)
Design loadHS 25 or greater
Structure length303 ft (92.4 m)
Longest span200 ft (61 m)
Deck width18 ft (5.5 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deck18 ft (5.5 m)

Traffic and service

Average daily traffic380 (2020)
Projected traffic442 by 2025
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.6 million
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 949 over Cobleigh Rd.Big Butte CR built?

It was built in 1954, making it 71 years old in 2025.

What condition is County RD 949 over Cobleigh Rd.Big Butte CR 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 July 2023.

How much traffic does County RD 949 over Cobleigh Rd.Big Butte CR carry?

About 380 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is County RD 949 over Cobleigh Rd.Big Butte CR?

The structure is 303 ft (92.4 m) long with a longest span of 200 ft (61 m) and a deck 18 ft wide.

Who owns County RD 949 over Cobleigh Rd.Big Butte CR?

It is owned by the County Highway Agency.