US Bridges

US Highway 199 NB over Hillside Above River

Good

Del Norte County, California · 01-DN-199-7.32 · Structure no. 01 0074

Built
1994
31 years old
Condition
Good
inspected September 2024
Type
Box Beam or Girders - Multiple
Concrete
Length
102 ft
1 main span
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 box beam or girders - multiple carrying US Highway 199 NB over Hillside Above River in Del Norte County, California. It was built in 1994, so it is 31 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 6,019 by 2042. The structure is 102 ft (31.2 m) long and 17 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesUS Highway 199 NB
CrossesHillside Above River
Location01-DN-199-7.32
RouteU.S. Route 199
Coordinates41.80378, -124.05244
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length102 ft (31.2 m)
Longest span98 ft (30 m)
Deck width17 ft (5.1 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,300 (2009)
Projected traffic6,019 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-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 1994, making it 31 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 102 ft (31.2 m) long with a longest span of 98 ft (30 m) and a deck 17 ft wide.

Who owns US Highway 199 NB over Hillside Above River?

It is owned by the State Highway Agency.