US Bridges

State Route 1 over Big Sur River

Fair

Monterey County, California · 05-MON-001-46.60 · Structure no. 44 0021

Built
1940
85 years old
Condition
Fair
inspected February 2025
Type
Tee Beam
Concrete Continuous
Length
220 ft
5 main spans
Daily traffic
4,050
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Big Sur River is a concrete continuous tee beam carrying State Route 1 over Big Sur River in Monterey County, California. It was built in 1940, so it is 85 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 4,050 vehicles a day, roughly 1% of them trucks, projected to reach 3,117 by 2045. The structure is 220 ft (67.1 m) long and 38 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesState Route 1
CrossesBig Sur River
Location05-MON-001-46.60
RouteState Highway 1
Coordinates36.25006, -121.78618
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length220 ft (67.1 m)
Longest span69 ft (21 m)
Deck width38 ft (11.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,050 (2009)
Projected traffic3,117 by 2045
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 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 1 over Big Sur River built?

It was built in 1940, making it 85 years old in 2025.

What condition is State Route 1 over Big Sur 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 February 2025.

How much traffic does State Route 1 over Big Sur River carry?

About 4,050 vehicles per day (2009 count), of which roughly 1% are trucks.

How long is State Route 1 over Big Sur River?

The structure is 220 ft (67.1 m) long with a longest span of 69 ft (21 m) and a deck 38 ft wide.

Who owns State Route 1 over Big Sur River?

It is owned by the State Highway Agency.