US Bridges

Or 99E(HWY 81)CO over Clarkamette Park

Fair

Clackamas County, Oregon · 1.2 MI N of Oregon City · Structure no. 01618A01E 01138

Built
1990
35 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
103 ft
1 main span
Daily traffic
33,139
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99E(HWY 81)CO over Clarkamette Park is a prestressed concrete stringer/multi-beam or girder carrying Or 99E(HWY 81)CO over Clarkamette Park in Clackamas County, Oregon. It was built in 1990, so it is 35 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 33,139 vehicles a day, roughly 1% of them trucks, projected to reach 41,100 by 2042. The structure is 103 ft (31.4 m) long and 104 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesOr 99E(HWY 81)CO
CrossesClarkamette Park
Location1.2 MI N of Oregon City
RouteState Highway 99
CountyClackamas County
StateOregon
Coordinates45.37037, -122.60118
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating31.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length103 ft (31.4 m)
Longest span103 ft (31.4 m)
Deck width104 ft (31.7 m)
Roadway width71 ft (21.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,139 (2022)
Projected traffic41,100 by 2042
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$528,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Or 99E(HWY 81)CO over Clarkamette Park built?

It was built in 1990, making it 35 years old in 2025.

What condition is Or 99E(HWY 81)CO over Clarkamette Park 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)CO over Clarkamette Park carry?

About 33,139 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Or 99E(HWY 81)CO over Clarkamette Park?

The structure is 103 ft (31.4 m) long with a longest span of 103 ft (31.4 m) and a deck 104 ft wide.

Who owns Or 99E(HWY 81)CO over Clarkamette Park?

It is owned by the State Highway Agency.