US Bridges

Socrates Mine RD over Gunning Creek

Fair

Lake County, California · 1.9 MI W/O State RTE 175 · Structure no. 14C0104

Built
1981
44 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
59 ft
3 main spans
Daily traffic
546
2008 count
Owner
County
County Highway Agency

About this bridge

Socrates Mine RD over Gunning Creek is a steel continuous stringer/multi-beam or girder carrying Socrates Mine RD over Gunning Creek in Lake County, California. It was built in 1981, so it is 44 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 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 546 vehicles a day, roughly 20% of them trucks, projected to reach 1,112 by 2044. The structure is 59 ft (18.1 m) long and 28 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesSocrates Mine RD
CrossesGunning Creek
Location1.9 MI W/O State RTE 175
RouteCounty Highway 0
CountyLake County
StateCalifornia
Coordinates38.78489, -122.71208
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckCorrugated steel
Main spans3
Design loadUnknown
Structure length59 ft (18.1 m)
Longest span34 ft (10.4 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic546 (2008)
Projected traffic1,112 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 Socrates Mine RD over Gunning Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is Socrates Mine RD over Gunning 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 March 2024.

How much traffic does Socrates Mine RD over Gunning Creek carry?

About 546 vehicles per day (2008 count), of which roughly 20% are trucks.

How long is Socrates Mine RD over Gunning Creek?

The structure is 59 ft (18.1 m) long with a longest span of 34 ft (10.4 m) and a deck 28 ft wide.

Who owns Socrates Mine RD over Gunning Creek?

It is owned by the County Highway Agency.