US Bridges

Fdr 18 over Canyon Creek

Fair

Nevada County, California · S8 T18N R12E · Structure no. 051755000001005

Built
1939
86 years old
Condition
Fair
inspected July 2023
Type
Girder and Floorbeam System
Steel
Length
53 ft
1 main span
Daily traffic
100
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 18 over Canyon Creek is a steel girder and floorbeam system carrying Fdr 18 over Canyon Creek in Nevada County, California. It was built in 1939, so it is 86 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 100 vehicles a day, roughly 1% of them trucks, projected to reach 150 by 2045. The structure is 53 ft (16.2 m) long and 12 ft wide.

CarriesFdr 18
CrossesCanyon Creek
LocationS8 T18N R12E
RouteFederal Lands Road 18
Coordinates39.44309, -120.65805
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating73.2 US tons
Inventory rating55.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length53 ft (16.2 m)
Longest span51 ft (15.4 m)
Deck width12 ft (3.7 m)
Roadway width11 ft (3.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (—)
Projected traffic150 by 2045
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 18 over Canyon Creek built?

It was built in 1939, making it 86 years old in 2025.

What condition is Fdr 18 over Canyon 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 July 2023.

How much traffic does Fdr 18 over Canyon Creek carry?

About 100 vehicles per day (latest count), of which roughly 1% are trucks.

How long is Fdr 18 over Canyon Creek?

The structure is 53 ft (16.2 m) long with a longest span of 51 ft (15.4 m) and a deck 12 ft wide.

Who owns Fdr 18 over Canyon Creek?

It is owned by the U.S. Forest Service.