US Bridges

HWY 100 over Shepperds Dell

FairPosted for load

Multnomah County, Oregon · 6.5 MI E Corbett · Structure no. 04528 125 01498

Built
1914
111 years old
Condition
Fair
inspected September 2023
Type
Arch - Deck
Concrete
Length
150 ft
1 main span
Daily traffic
815
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 100 over Shepperds Dell is a concrete arch - deck carrying HWY 100 over Shepperds Dell in Multnomah County, Oregon. It was built in 1914, so it is 111 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 815 vehicles a day, roughly 4% of them trucks, projected to reach 1,100 by 2042. The structure is 150 ft (45.7 m) long and 25 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesHWY 100
CrossesShepperds Dell
Location6.5 MI E Corbett
RouteState Highway 30
CountyMultnomah County
StateOregon
Coordinates45.54664, -122.19777
Functional classRural Major 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating13.6 US tons
Inventory rating10.4 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadH 15
Structure length150 ft (45.7 m)
Longest span100 ft (30.5 m)
Deck width25 ft (7.7 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic815 (2022)
Projected traffic1,100 by 2042
Trucks4%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$769,000
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 100 over Shepperds Dell built?

It was built in 1914, making it 111 years old in 2025.

What condition is HWY 100 over Shepperds Dell 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 September 2023.

How much traffic does HWY 100 over Shepperds Dell carry?

About 815 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is HWY 100 over Shepperds Dell?

The structure is 150 ft (45.7 m) long with a longest span of 100 ft (30.5 m) and a deck 25 ft wide.

Who owns HWY 100 over Shepperds Dell?

It is owned by the State Highway Agency.