US Bridges

Or 99E(HWY 81) over Johnson Creek

Fair

Multnomah County, Oregon · 0.2 MI N Milwaukie Cc · Structure no. 02008A01E 00443

Built
1991
34 years old
Condition
Fair
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
96 ft
1 main span
Daily traffic
45,032
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99E(HWY 81) over Johnson Creek is a prestressed concrete box beam or girders - multiple carrying Or 99E(HWY 81) over Johnson Creek in Multnomah County, Oregon. It was built in 1991, so it is 34 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.

It carries about 45,032 vehicles a day, roughly 3% of them trucks, projected to reach 51,600 by 2042. The structure is 96 ft (29.3 m) long and 122 ft wide. If it were closed, the detour would be 9.3 mi (15 km).

CarriesOr 99E(HWY 81)
CrossesJohnson Creek
Location0.2 MI N Milwaukie Cc
RouteState Highway 99
StateOregon
Coordinates45.46386, -122.63844
Functional classUrban Other Principal 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating29.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length96 ft (29.3 m)
Longest span96 ft (29.3 m)
Deck width122 ft (37.1 m)
Roadway width102 ft (31.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45,032 (2022)
Projected traffic51,600 by 2042
Trucks3%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.3 mi (15 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Or 99E(HWY 81) over Johnson Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is Or 99E(HWY 81) 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 November 2024.

How much traffic does Or 99E(HWY 81) over Johnson Creek carry?

About 45,032 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Or 99E(HWY 81) over Johnson Creek?

The structure is 96 ft (29.3 m) long with a longest span of 96 ft (29.3 m) and a deck 122 ft wide.

Who owns Or 99E(HWY 81) over Johnson Creek?

It is owned by the State Highway Agency.