US Bridges

Montgomery RD over Jonive Creek

Fair

Sonoma County, California · 0.1 MI N Bodega HWY · Structure no. 20C0317

Built
1963
62 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
62 ft
3 main spans
Daily traffic
270
2015 count
Owner
County
County Highway Agency

About this bridge

Montgomery RD over Jonive Creek is a concrete continuous slab carrying Montgomery RD over Jonive Creek in Sonoma County, California. It was built in 1963, so it is 62 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 6 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 270 vehicles a day, roughly 1% of them trucks, projected to reach 437 by 2042. The structure is 62 ft (18.9 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMontgomery RD
CrossesJonive Creek
Location0.1 MI N Bodega HWY
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.39606, -122.86995
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span24 ft (7.3 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic270 (2015)
Projected traffic437 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Montgomery RD over Jonive Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is Montgomery RD over Jonive 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 November 2024.

How much traffic does Montgomery RD over Jonive Creek carry?

About 270 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is Montgomery RD over Jonive Creek?

The structure is 62 ft (18.9 m) long with a longest span of 24 ft (7.3 m) and a deck 25 ft wide.

Who owns Montgomery RD over Jonive Creek?

It is owned by the County Highway Agency.