US Bridges

398th Avenue over Enemy Ck

PoorPosted for load

Davison County, South Dakota · 11W & 3.7 S Mitchell · Structure no. 000000018040137

Built
1915
110 years old, rebuilt 1965
Condition
Poor
inspected July 2024
Type
Truss - Thru
Steel
Length
37 ft
1 main span
Daily traffic
64
2022 count
Owner
County
County Highway Agency

About this bridge

398th Avenue over Enemy Ck is a steel truss - thru carrying 398th Avenue over Enemy Ck in Davison County, South Dakota. It was built in 1915 and reconstructed in 1965, so it is 110 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 2 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 64 vehicles a day, roughly 2% of them trucks, projected to reach 64 by 2032. The structure is 37 ft (11.3 m) long and 18 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries398th Avenue
CrossesEnemy Ck
Location11W & 3.7 S Mitchell
RouteCounty Highway 0
Coordinates43.64799, -98.24601
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating7.6 US tons
Inventory rating5.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length37 ft (11.3 m)
Longest span35 ft (10.7 m)
Deck width18 ft (5.4 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic64 (2022)
Projected traffic64 by 2032
Trucks2%
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 statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 398th Avenue over Enemy Ck built?

It was built in 1915, making it 110 years old in 2025. It was reconstructed in 1965.

What condition is 398th Avenue over Enemy Ck 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 July 2024.

How much traffic does 398th Avenue over Enemy Ck carry?

About 64 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 398th Avenue over Enemy Ck?

The structure is 37 ft (11.3 m) long with a longest span of 35 ft (10.7 m) and a deck 18 ft wide.

Who owns 398th Avenue over Enemy Ck?

It is owned by the County Highway Agency.