US Bridges

US016AW over US016 E

Fair

Pennington County, South Dakota · Keystone Interchange · Structure no. 000000052308411

Built
1968
57 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
170 ft
3 main spans
Daily traffic
3,835
2024 count
Owner
State
State Highway Agency

About this bridge

US016AW over US016 E is a wood or timber stringer/multi-beam or girder carrying US016AW over US016 E in Pennington County, South Dakota. It was built in 1968, so it is 57 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 3,835 vehicles a day, roughly 12% of them trucks, projected to reach 6,048 by 2044. The structure is 170 ft (51.8 m) long and 28 ft wide.

CarriesUS016AW
CrossesUS016 E
LocationKeystone Interchange
RouteU.S. Route 16
Coordinates43.92487, -103.44245
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating84.5 US tons
Inventory rating53.6 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length170 ft (51.8 m)
Longest span54 ft (16.5 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck15 ft (4.6 m)

Traffic and service

Average daily traffic3,835 (2024)
Projected traffic6,048 by 2044
Trucks12%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US016AW over US016 E built?

It was built in 1968, making it 57 years old in 2025.

What condition is US016AW over US016 E in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2024.

How much traffic does US016AW over US016 E carry?

About 3,835 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is US016AW over US016 E?

The structure is 170 ft (51.8 m) long with a longest span of 54 ft (16.5 m) and a deck 28 ft wide.

Who owns US016AW over US016 E?

It is owned by the State Highway Agency.