US Bridges

370th Avenue over S Fork Snake Creek

PoorPosted for load

Faulk County, South Dakota · 9.7N & 2W Zell · Structure no. 000000025390143

Built
1920
105 years old
Condition
Poor
inspected October 2024
Type
Truss - Thru
Steel
Length
72 ft
1 main span
Daily traffic
36
2022 count
Owner
County
County Highway Agency

About this bridge

370th Avenue over S Fork Snake Creek is a steel truss - thru carrying 370th Avenue over S Fork Snake Creek in Faulk County, South Dakota. It was built in 1920, so it is 105 years old, older than the South Dakota average of 48.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 36 vehicles a day, roughly 2% of them trucks, projected to reach 36 by 2032. The structure is 72 ft (21.9 m) long and 16 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Carries370th Avenue
CrossesS Fork Snake Creek
Location9.7N & 2W Zell
RouteCounty Highway 0
Coordinates45.03906, -98.77882
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating3.7 US tons
Inventory rating3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length72 ft (21.9 m)
Longest span70 ft (21.3 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36 (2022)
Projected traffic36 by 2032
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.5 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 370th Avenue over S Fork Snake Creek built?

It was built in 1920, making it 105 years old in 2025.

What condition is 370th Avenue over S Fork Snake Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does 370th Avenue over S Fork Snake Creek carry?

About 36 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 370th Avenue over S Fork Snake Creek?

The structure is 72 ft (21.9 m) long with a longest span of 70 ft (21.3 m) and a deck 16 ft wide.

Who owns 370th Avenue over S Fork Snake Creek?

It is owned by the County Highway Agency.