US Bridges

US Highway 199 NB over Hillside Above River

Good

Del Norte County, California · 01-DN-199-8.20 · Structure no. 01 0081

Built
2017
8 years old
Condition
Good
inspected September 2024
Type
Slab
Concrete Continuous
Length
221 ft
7 main spans
Daily traffic
4,300
2009 count
Owner
State
State Highway Agency

About this bridge

US Highway 199 NB over Hillside Above River is a concrete continuous slab carrying US Highway 199 NB over Hillside Above River in Del Norte County, California. It was built in 2017, so it is 8 years old, younger than the California average of 54.8 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 4,300 vehicles a day, roughly 11% of them trucks, projected to reach 5,900 by 2042. The structure is 221 ft (67.5 m) long and 22 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesUS Highway 199 NB
CrossesHillside Above River
Location01-DN-199-8.20
RouteState Highway 199
Coordinates41.80804, -124.05176
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHL 93
Structure length221 ft (67.5 m)
Longest span33 ft (10.2 m)
Deck width22 ft (6.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,300 (2009)
Projected traffic5,900 by 2042
Trucks11%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed123.7 mi (199 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US Highway 199 NB over Hillside Above River built?

It was built in 2017, making it 8 years old in 2025.

What condition is US Highway 199 NB over Hillside Above River 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 September 2024.

How much traffic does US Highway 199 NB over Hillside Above River carry?

About 4,300 vehicles per day (2009 count), of which roughly 11% are trucks.

How long is US Highway 199 NB over Hillside Above River?

The structure is 221 ft (67.5 m) long with a longest span of 33 ft (10.2 m) and a deck 22 ft wide.

Who owns US Highway 199 NB over Hillside Above River?

It is owned by the State Highway Agency.