US Bridges

US 20 over Oakland Waste Ditch

Good

Bonneville County, Idaho · 4.8 W. Idaho Falls · Structure no. 000000000012295

Built
1976
49 years old, rebuilt 1996
Condition
Good
inspected November 2024
Type
Culvert
Steel
Length
22 ft
1 main span
Daily traffic
4,800
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 over Oakland Waste Ditch is a steel culvert carrying US 20 over Oakland Waste Ditch in Bonneville County, Idaho. It was built in 1976 and reconstructed in 1996, so it is 49 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,800 vehicles a day, roughly 6% of them trucks, projected to reach 7,200 by 2042. The structure is 22 ft (6.7 m) long and 207 ft wide. If it were closed, the detour would be 65.2 mi (105 km).

Location

Open in Google Maps
CarriesUS 20
CrossesOakland Waste Ditch
Location4.8 W. Idaho Falls
RouteU.S. Route 20
CountyBonneville County
StateIdaho
Coordinates43.49703, -112.13786
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span22 ft (6.7 m)
Deck width207 ft (63.1 m)
Roadway width75 ft (22.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,800 (2023)
Projected traffic7,200 by 2042
Trucks6%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed65.2 mi (105 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$594,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 over Oakland Waste Ditch built?

It was built in 1976, making it 49 years old in 2025. It was reconstructed in 1996.

What condition is US 20 over Oakland Waste Ditch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does US 20 over Oakland Waste Ditch carry?

About 4,800 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 20 over Oakland Waste Ditch?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 207 ft wide.

Who owns US 20 over Oakland Waste Ditch?

It is owned by the State Highway Agency.