US Bridges

Morgan Slough Road over Morgan Slough

Good

Humboldt County, California · North of Camp Weott Road · Structure no. 04C0192

Built
1984
41 years old, rebuilt 2015
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
90 ft
1 main span
Daily traffic
31
2014 count
Owner
County
County Highway Agency

About this bridge

Morgan Slough Road over Morgan Slough is a steel stringer/multi-beam or girder carrying Morgan Slough Road over Morgan Slough in Humboldt County, California. It was built in 1984 and reconstructed in 2015, so it is 41 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 31 vehicles a day, roughly 3% of them trucks, projected to reach 64 by 2041. The structure is 90 ft (27.3 m) long and 10 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesMorgan Slough Road
CrossesMorgan Slough
LocationNorth of Camp Weott Road
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.61441, -124.29342
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.3 US tons
Inventory rating17.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length90 ft (27.3 m)
Longest span72 ft (22 m)
Deck width10 ft (3.1 m)
Roadway width10 ft (3.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31 (2014)
Projected traffic64 by 2041
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Morgan Slough Road over Morgan Slough built?

It was built in 1984, making it 41 years old in 2025. It was reconstructed in 2015.

What condition is Morgan Slough Road over Morgan Slough 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 August 2024.

How much traffic does Morgan Slough Road over Morgan Slough carry?

About 31 vehicles per day (2014 count), of which roughly 3% are trucks.

How long is Morgan Slough Road over Morgan Slough?

The structure is 90 ft (27.3 m) long with a longest span of 72 ft (22 m) and a deck 10 ft wide.

Who owns Morgan Slough Road over Morgan Slough?

It is owned by the County Highway Agency.