US Bridges

Hardin RD over Maxwell Creek

Fair

Napa County, California · 1.6 MI SE Pope Cyn Road · Structure no. 21C0058

Built
1909
116 years old
Condition
Fair
inspected August 2023
Type
Arch - Deck
Masonry
Length
38 ft
1 main span
Daily traffic
140
2014 count
Owner
County
County Highway Agency

About this bridge

Hardin RD over Maxwell Creek is a masonry arch - deck carrying Hardin RD over Maxwell Creek in Napa County, California. It was built in 1909, so it is 116 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 140 vehicles a day, roughly 10% of them trucks, projected to reach 217 by 2041. The structure is 38 ft (11.6 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesHardin RD
CrossesMaxwell Creek
Location1.6 MI SE Pope Cyn Road
RouteCounty Highway 0
CountyNapa County
StateCalifornia
Coordinates38.60142, -122.37089
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
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.4 US tons
Inventory rating19 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadUnknown
Structure length38 ft (11.6 m)
Longest span23 ft (6.9 m)
Deck width20 ft (6 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (2014)
Projected traffic217 by 2041
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Hardin RD over Maxwell Creek built?

It was built in 1909, making it 116 years old in 2025.

What condition is Hardin RD over Maxwell 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 Hardin RD over Maxwell Creek carry?

About 140 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Hardin RD over Maxwell Creek?

The structure is 38 ft (11.6 m) long with a longest span of 23 ft (6.9 m) and a deck 20 ft wide.

Who owns Hardin RD over Maxwell Creek?

It is owned by the County Highway Agency.