US Bridges

County RD 18 over South Myrtle Creek

FairPosted for load

Douglas County, Oregon · 10.6 MI E of Myrtle Creek · Structure no. 19C042 18 1060

Built
1961
64 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
102 ft
3 main spans
Daily traffic
286
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 18 over South Myrtle Creek is a steel stringer/multi-beam or girder carrying County RD 18 over South Myrtle Creek in Douglas County, Oregon. It was built in 1961, so it is 64 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. Its operating status is: posted for load restriction.

It carries about 286 vehicles a day, roughly 7% of them trucks, projected to reach 326 by 2025. The structure is 102 ft (31.1 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesCounty RD 18
CrossesSouth Myrtle Creek
Location10.6 MI E of Myrtle Creek
RouteCounty Highway 0A382
CountyDouglas County
StateOregon
Coordinates43.03038, -123.10586
Functional classRural Minor Collector

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.
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 statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
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 rating23.6 US tons
Inventory rating18.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length102 ft (31.1 m)
Longest span40 ft (12.2 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic286 (2020)
Projected traffic326 by 2025
Trucks7%
Lanes on structure2
Traffic directionTwo-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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 18 over South Myrtle Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is County RD 18 over South Myrtle 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 June 2023.

How much traffic does County RD 18 over South Myrtle Creek carry?

About 286 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is County RD 18 over South Myrtle Creek?

The structure is 102 ft (31.1 m) long with a longest span of 40 ft (12.2 m) and a deck 24 ft wide.

Who owns County RD 18 over South Myrtle Creek?

It is owned by the County Highway Agency.