US Bridges

Alexander Ave over Susan River

Fair

Lassen County, California · 0.22 MI S of S.H. 36 · Structure no. 07C0018

Built
1986
39 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Concrete
Length
80 ft
1 main span
Daily traffic
4,850
1997 count
Owner
City
City or Municipal Highway Agency

About this bridge

Alexander Ave over Susan River is a concrete box beam or girders - multiple carrying Alexander Ave over Susan River in Lassen County, California. It was built in 1986, so it is 39 years old, younger 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 4,850 vehicles a day, roughly 3% of them trucks, projected to reach 11,443 by 2040. The structure is 80 ft (24.5 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesAlexander Ave
CrossesSusan River
Location0.22 MI S of S.H. 36
RouteCity Street 0
CountyLassen County
StateCalifornia
Coordinates40.41329, -120.65195
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length80 ft (24.5 m)
Longest span79 ft (24.1 m)
Deck width50 ft (15.3 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,850 (1997)
Projected traffic11,443 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Alexander Ave over Susan River built?

It was built in 1986, making it 39 years old in 2025.

What condition is Alexander Ave over Susan River 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 Alexander Ave over Susan River carry?

About 4,850 vehicles per day (1997 count), of which roughly 3% are trucks.

How long is Alexander Ave over Susan River?

The structure is 80 ft (24.5 m) long with a longest span of 79 ft (24.1 m) and a deck 50 ft wide.

Who owns Alexander Ave over Susan River?

It is owned by the City or Municipal Highway Agency.