US Bridges

County Road 75 over Pit River

Fair

Modoc County, California · 0.3 MI South of SR 299 · Structure no. 03C0091

Built
1919
106 years old, rebuilt 1968
Condition
Fair
inspected August 2023
Type
Truss - Thru
Steel
Length
103 ft
1 main span
Daily traffic
202
2017 count
Owner
County
County Highway Agency

About this bridge

County Road 75 over Pit River is a steel truss - thru carrying County Road 75 over Pit River in Modoc County, California. It was built in 1919 and reconstructed in 1968, so it is 106 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 202 vehicles a day, roughly 8% of them trucks, projected to reach 212 by 2041. The structure is 103 ft (31.5 m) long and 22 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesCounty Road 75
CrossesPit River
Location0.3 MI South of SR 299
RouteCounty Highway 0
CountyModoc County
StateCalifornia
Coordinates41.48146, -120.64009
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating33.2 US tons
Inventory rating19.6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length103 ft (31.5 m)
Longest span100 ft (30.5 m)
Deck width22 ft (6.7 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic202 (2017)
Projected traffic212 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 County Road 75 over Pit River built?

It was built in 1919, making it 106 years old in 2025. It was reconstructed in 1968.

What condition is County Road 75 over Pit River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.

How much traffic does County Road 75 over Pit River carry?

About 202 vehicles per day (2017 count), of which roughly 8% are trucks.

How long is County Road 75 over Pit River?

The structure is 103 ft (31.5 m) long with a longest span of 100 ft (30.5 m) and a deck 22 ft wide.

Who owns County Road 75 over Pit River?

It is owned by the County Highway Agency.