US Bridges

324 Avenue over Mocassin Ck

PoorPosted for load

Tripp County, South Dakota · 0.3N & 0.2E of Hamill · Structure no. 000000062283121

Built
1924
101 years old
Condition
Poor
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
2 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

324 Avenue over Mocassin Ck is a steel stringer/multi-beam or girder carrying 324 Avenue over Mocassin Ck in Tripp County, South Dakota. It was built in 1924, so it is 101 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. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, projected to reach 50 by 2042. The structure is 60 ft (18.4 m) long and 20 ft wide.

Location

Open in Google Maps
Carries324 Avenue
CrossesMocassin Ck
Location0.3N & 0.2E of Hamill
RouteCounty Highway 0
CountyTripp County
StateSouth Dakota
Coordinates43.60061, -99.67837
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating13.7 US tons
Inventory rating8.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans2
Design loadHS 20 + Mod
Structure length60 ft (18.4 m)
Longest span30 ft (9.1 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic50 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 324 Avenue over Mocassin Ck built?

It was built in 1924, making it 101 years old in 2025.

What condition is 324 Avenue over Mocassin 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 June 2023.

How much traffic does 324 Avenue over Mocassin Ck carry?

About 20 vehicles per day (2022 count).

How long is 324 Avenue over Mocassin Ck?

The structure is 60 ft (18.4 m) long with a longest span of 30 ft (9.1 m) and a deck 20 ft wide.

Who owns 324 Avenue over Mocassin Ck?

It is owned by the County Highway Agency.