US Bridges

370th Avenue over Creek

Poor

Edmunds County, South Dakota · 12E & 6.4N of Ipswich · Structure no. 000000023450034

Built
1974
51 years old
Condition
Poor
inspected June 2023
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
114
2022 count
Owner
County
County Highway Agency

About this bridge

370th Avenue over Creek is a concrete channel beam carrying 370th Avenue over Creek in Edmunds County, South Dakota. It was built in 1974, so it is 51 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 4 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.

It carries about 114 vehicles a day, roughly 3% of them trucks, projected to reach 114 by 2032. The structure is 31 ft (9.4 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries370th Avenue
CrossesCreek
Location12E & 6.4N of Ipswich
RouteCounty Highway 6179
Coordinates45.54205, -98.78407
Functional classRural Major Collector

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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic114 (2022)
Projected traffic114 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$929,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 370th Avenue over Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is 370th Avenue over 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 June 2023.

How much traffic does 370th Avenue over Creek carry?

About 114 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 370th Avenue over Creek?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 32 ft wide.

Who owns 370th Avenue over Creek?

It is owned by the County Highway Agency.