US Bridges

State Route 1 over Granite Canyon

Good

Monterey County, California · 05-MON-001-64.33 · Structure no. 44 0012

Built
1932
93 years old, rebuilt 1998
Condition
Good
inspected July 2023
Type
Arch - Deck
Concrete
Length
288 ft
1 main span
Daily traffic
11,100
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Granite Canyon is a concrete arch - deck carrying State Route 1 over Granite Canyon in Monterey County, California. It was built in 1932 and reconstructed in 1998, so it is 93 years old, older 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 11,100 vehicles a day, projected to reach 5,160 by 2041. The structure is 288 ft (87.8 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesGranite Canyon
Location05-MON-001-64.33
RouteState Highway 1
CountyMonterey County
StateCalifornia
Coordinates36.43539, -121.91887
Functional classRural Minor Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.3 US tons
Inventory rating22.8 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadUnknown
Structure length288 ft (87.8 m)
Longest span127 ft (38.7 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,100 (2009)
Projected traffic5,160 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 statusEligible 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 Granite Canyon built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1998.

What condition is State Route 1 over Granite Canyon 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 July 2023.

How much traffic does State Route 1 over Granite Canyon carry?

About 11,100 vehicles per day (2009 count).

How long is State Route 1 over Granite Canyon?

The structure is 288 ft (87.8 m) long with a longest span of 127 ft (38.7 m) and a deck 28 ft wide.

Who owns State Route 1 over Granite Canyon?

It is owned by the State Highway Agency.