US Bridges

Topsy Grade Road over Rock Creek

FairPosted for load

Klamath County, Oregon · 15 MI W of Dorris HWY 97 · Structure no. 21242 000 01470

Built
1984
41 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
32 ft
1 main span
Daily traffic
1
2020 count
Owner
County
County Highway Agency

About this bridge

Topsy Grade Road over Rock Creek is a wood or timber stringer/multi-beam or girder carrying Topsy Grade Road over Rock Creek in Klamath County, Oregon. It was built in 1984, so it is 41 years old, younger 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 1 vehicles a day, projected to reach 1 by 2025. The structure is 32 ft (9.8 m) long and 16 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesTopsy Grade Road
CrossesRock Creek
Location15 MI W of Dorris HWY 97
RouteCounty Highway 0
CountyKlamath County
StateOregon
Coordinates42.01235, -122.11428
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.
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating16.4 US tons
Inventory rating12.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width16 ft (4.9 m)
Roadway width11 ft (3.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1 (2020)
Projected traffic1 by 2025
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$164,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Topsy Grade Road over Rock Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Topsy Grade Road over Rock 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 Topsy Grade Road over Rock Creek carry?

About 1 vehicles per day (2020 count).

How long is Topsy Grade Road over Rock Creek?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 16 ft wide.

Who owns Topsy Grade Road over Rock Creek?

It is owned by the County Highway Agency.