US Bridges

8th Avenue SE over Moccasin Creek

PoorPosted for load

Brown County, South Dakota · 8th Ave. SE - Aberdeen · Structure no. 000000007123331

Built
1976
49 years old
Condition
Poor
inspected October 2024
Type
Channel Beam
Concrete
Length
62 ft
2 main spans
Daily traffic
500
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

8th Avenue SE over Moccasin Creek is a concrete channel beam carrying 8th Avenue SE over Moccasin Creek in Brown County, South Dakota. It was built in 1976, so it is 49 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 500 vehicles a day, roughly 2% of them trucks, projected to reach 500 by 2032. The structure is 62 ft (18.9 m) long and 38 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Carries8th Avenue SE
CrossesMoccasin Creek
Location8th Ave. SE - Aberdeen
RouteCity Street 0
Coordinates45.45693, -98.46971
Functional classUrban 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.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating4.5 US tons
Inventory rating3.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span31 ft (9.4 m)
Deck width38 ft (11.7 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2022)
Projected traffic500 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$1.5 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 8th Avenue SE over Moccasin Creek built?

It was built in 1976, making it 49 years old in 2025.

What condition is 8th Avenue SE over Moccasin 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 8th Avenue SE over Moccasin Creek carry?

About 500 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 8th Avenue SE over Moccasin Creek?

The structure is 62 ft (18.9 m) long with a longest span of 31 ft (9.4 m) and a deck 38 ft wide.

Who owns 8th Avenue SE over Moccasin Creek?

It is owned by the City or Municipal Highway Agency.