US Bridges

Zenia Bluff RD over Mud Creek

Good

Trinity County, California · West of Zenia · Structure no. 05C0229

Built
2003
22 years old
Condition
Good
inspected June 2023
Type
Slab
Prestressed Concrete
Length
69 ft
1 main span
Daily traffic
140
2002 count
Owner
County
County Highway Agency

About this bridge

Zenia Bluff RD over Mud Creek is a prestressed concrete slab carrying Zenia Bluff RD over Mud Creek in Trinity County, California. It was built in 2003, so it is 22 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 140 vehicles a day, roughly 3% of them trucks, projected to reach 150 by 2042. The structure is 69 ft (21 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesZenia Bluff RD
CrossesMud Creek
LocationWest of Zenia
RouteCounty Highway 0
Coordinates40.20305, -123.51813
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.4 US tons
Inventory rating46.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length69 ft (21 m)
Longest span66 ft (20 m)
Deck width28 ft (8.5 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (2002)
Projected traffic150 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Zenia Bluff RD over Mud Creek built?

It was built in 2003, making it 22 years old in 2025.

What condition is Zenia Bluff RD over Mud Creek 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 June 2023.

How much traffic does Zenia Bluff RD over Mud Creek carry?

About 140 vehicles per day (2002 count), of which roughly 3% are trucks.

How long is Zenia Bluff RD over Mud Creek?

The structure is 69 ft (21 m) long with a longest span of 66 ft (20 m) and a deck 28 ft wide.

Who owns Zenia Bluff RD over Mud Creek?

It is owned by the County Highway Agency.