US Bridges

M. Rock Creek Ln. over Rock Creek

Fair

Gilliam County, Oregon · 0.9 MI NW of HWY 19 · Structure no. 21C12 532 00930

Built
1960
65 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete Continuous
Length
100 ft
3 main spans
Daily traffic
57
2020 count
Owner
County
County Highway Agency

About this bridge

M. Rock Creek Ln. over Rock Creek is a concrete continuous tee beam carrying M. Rock Creek Ln. over Rock Creek in Gilliam County, Oregon. It was built in 1960, so it is 65 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 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 57 vehicles a day, roughly 10% of them trucks, projected to reach 57 by 2025. The structure is 100 ft (30.5 m) long and 29 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesM. Rock Creek Ln.
CrossesRock Creek
Location0.9 MI NW of HWY 19
RouteCounty Highway 0
CountyGilliam County
StateOregon
Coordinates45.50502, -120.1805
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating32.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span40 ft (12.2 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic57 (2020)
Projected traffic57 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 M. Rock Creek Ln. over Rock Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is M. Rock Creek Ln. 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 M. Rock Creek Ln. over Rock Creek carry?

About 57 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is M. Rock Creek Ln. over Rock Creek?

The structure is 100 ft (30.5 m) long with a longest span of 40 ft (12.2 m) and a deck 29 ft wide.

Who owns M. Rock Creek Ln. over Rock Creek?

It is owned by the County Highway Agency.