US Bridges

Montgomery DR over Santa Rosa Creek

Good

Sonoma County, California · Pierce ST & Sotoyome DR · Structure no. 20C0170

Built
1906
119 years old, rebuilt 1948
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
151 ft
4 main spans
Daily traffic
8,600
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

Montgomery DR over Santa Rosa Creek is a steel stringer/multi-beam or girder carrying Montgomery DR over Santa Rosa Creek in Sonoma County, California. It was built in 1906 and reconstructed in 1948, so it is 119 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 8,600 vehicles a day, roughly 2% of them trucks, projected to reach 8,586 by 2042. The structure is 151 ft (46 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMontgomery DR
CrossesSanta Rosa Creek
LocationPierce ST & Sotoyome DR
RouteCity Street 0
CountySonoma County
StateCalifornia
Coordinates38.44283, -122.7032
Functional classUrban Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51.5 US tons
Inventory rating31.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length151 ft (46 m)
Longest span59 ft (18 m)
Deck width36 ft (11 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,600 (2010)
Projected traffic8,586 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 Montgomery DR over Santa Rosa Creek built?

It was built in 1906, making it 119 years old in 2025. It was reconstructed in 1948.

What condition is Montgomery DR over Santa Rosa Creek 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 August 2024.

How much traffic does Montgomery DR over Santa Rosa Creek carry?

About 8,600 vehicles per day (2010 count), of which roughly 2% are trucks.

How long is Montgomery DR over Santa Rosa Creek?

The structure is 151 ft (46 m) long with a longest span of 59 ft (18 m) and a deck 36 ft wide.

Who owns Montgomery DR over Santa Rosa Creek?

It is owned by the City or Municipal Highway Agency.