US Bridges

Pope ST over Sulphur Creek

Fair

Napa County, California · 0.25 MI N/W SR 29 · Structure no. 21C0110

Built
1908
117 years old, rebuilt 1950
Condition
Fair
inspected August 2023
Type
Arch - Deck
Masonry
Length
60 ft
1 main span
Daily traffic
2,790
2005 count
Owner
City
City or Municipal Highway Agency

About this bridge

Pope ST over Sulphur Creek is a masonry arch - deck carrying Pope ST over Sulphur Creek in Napa County, California. It was built in 1908 and reconstructed in 1950, so it is 117 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 2,790 vehicles a day, roughly 10% of them trucks, projected to reach 4,356 by 2041. The structure is 60 ft (18.3 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesPope ST
CrossesSulphur Creek
Location0.25 MI N/W SR 29
RouteCity Street 0
CountyNapa County
StateCalifornia
Coordinates38.505, -122.46386
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length60 ft (18.3 m)
Longest span47 ft (14.3 m)
Deck width32 ft (9.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,790 (2005)
Projected traffic4,356 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Pope ST over Sulphur Creek built?

It was built in 1908, making it 117 years old in 2025. It was reconstructed in 1950.

What condition is Pope ST over Sulphur 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 August 2023.

How much traffic does Pope ST over Sulphur Creek carry?

About 2,790 vehicles per day (2005 count), of which roughly 10% are trucks.

How long is Pope ST over Sulphur Creek?

The structure is 60 ft (18.3 m) long with a longest span of 47 ft (14.3 m) and a deck 32 ft wide.

Who owns Pope ST over Sulphur Creek?

It is owned by the City or Municipal Highway Agency.