US Bridges

SE Deardorf RD over B-91 over Johnson Creek

FairPosted for load

Multnomah County, Oregon · SE Deardorf RD Covered Br · Structure no. 51C05 000 00001

Built
1982
43 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
66 ft
1 main span
Daily traffic
1,719
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

SE Deardorf RD over B-91 over Johnson Creek is a wood or timber stringer/multi-beam or girder carrying SE Deardorf RD over B-91 over Johnson Creek in Multnomah County, Oregon. It was built in 1982, so it is 43 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 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 1,719 vehicles a day, roughly 2% of them trucks, projected to reach 1,841 by 2025. The structure is 66 ft (20.1 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSE Deardorf RD
CrossesB-91 over Johnson Creek
LocationSE Deardorf RD Covered Br
RouteCounty Highway 9745
StateOregon
Coordinates45.47207, -122.52384
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length66 ft (20.1 m)
Longest span63 ft (19.2 m)
Deck width33 ft (10.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic1,719 (2020)
Projected traffic1,841 by 2025
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 SE Deardorf RD over B-91 over Johnson Creek built?

It was built in 1982, making it 43 years old in 2025.

What condition is SE Deardorf RD over B-91 over Johnson 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 2024.

How much traffic does SE Deardorf RD over B-91 over Johnson Creek carry?

About 1,719 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is SE Deardorf RD over B-91 over Johnson Creek?

The structure is 66 ft (20.1 m) long with a longest span of 63 ft (19.2 m) and a deck 33 ft wide.

Who owns SE Deardorf RD over B-91 over Johnson Creek?

It is owned by the City or Municipal Highway Agency.