US Bridges

State Route 299 over Dry Creek

Fair

Modoc County, California · 02-MOD-299-0.93-ADIN · Structure no. 03 0012

Built
1929
96 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
1,400
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 299 over Dry Creek is a concrete continuous culvert carrying State Route 299 over Dry Creek in Modoc County, California. It was built in 1929, so it is 96 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 1,400 vehicles a day, roughly 16% of them trucks, projected to reach 1,673 by 2040. The structure is 31 ft (9.6 m) long and 60 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesState Route 299
CrossesDry Creek
Location02-MOD-299-0.93-ADIN
RouteState Highway 299
CountyModoc County
StateCalifornia
Coordinates41.19623, -120.94409
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length31 ft (9.6 m)
Longest span15 ft (4.6 m)
Deck width60 ft (18.3 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2015)
Projected traffic1,673 by 2040
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 299 over Dry Creek built?

It was built in 1929, making it 96 years old in 2025.

What condition is State Route 299 over Dry Creek 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 April 2023.

How much traffic does State Route 299 over Dry Creek carry?

About 1,400 vehicles per day (2015 count), of which roughly 16% are trucks.

How long is State Route 299 over Dry Creek?

The structure is 31 ft (9.6 m) long with a longest span of 15 ft (4.6 m) and a deck 60 ft wide.

Who owns State Route 299 over Dry Creek?

It is owned by the State Highway Agency.