US Bridges

County Road No 857 over Forest Cr/Hamliton Rd.

Fair

Jackson County, Oregon · 0.37 Milepost · Structure no. 07881 857 00037

Built
1954
71 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete Continuous
Length
85 ft
3 main spans
Daily traffic
752
2020 count
Owner
County
County Highway Agency

About this bridge

County Road No 857 over Forest Cr/Hamliton Rd. is a concrete continuous tee beam carrying County Road No 857 over Forest Cr/Hamliton Rd. 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 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 752 vehicles a day, roughly 10% of them trucks, projected to reach 875 by 2025. The structure is 85 ft (25.9 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty Road No 857
CrossesForest Cr/Hamliton Rd.
Location0.37 Milepost
RouteCounty Highway C0857
CountyJackson County
StateOregon
Coordinates42.23028, -123.06601
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.1 US tons
Inventory rating23.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length85 ft (25.9 m)
Longest span53 ft (16.1 m)
Deck width28 ft (8.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic752 (2020)
Projected traffic875 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road No 857 over Forest Cr/Hamliton Rd. built?

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

What condition is County Road No 857 over Forest Cr/Hamliton Rd. 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 June 2023.

How much traffic does County Road No 857 over Forest Cr/Hamliton Rd. carry?

About 752 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is County Road No 857 over Forest Cr/Hamliton Rd.?

The structure is 85 ft (25.9 m) long with a longest span of 53 ft (16.1 m) and a deck 28 ft wide.

Who owns County Road No 857 over Forest Cr/Hamliton Rd.?

It is owned by the County Highway Agency.