US Bridges

HWY 1416 over Trib. to Box Elder Creek

Fair

Pennington County, South Dakota · 8.1E New Underwood · Structure no. 000000052692290

Built
1936
89 years old, rebuilt 2009
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
34 ft
3 main spans
Daily traffic
115
2022 count
Owner
County
County Highway Agency

About this bridge

HWY 1416 over Trib. to Box Elder Creek is a concrete slab carrying HWY 1416 over Trib. to Box Elder Creek in Pennington County, South Dakota. It was built in 1936 and reconstructed in 2009, so it is 89 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 115 vehicles a day, roughly 2% of them trucks, projected to reach 115 by 2032. The structure is 34 ft (10.4 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesHWY 1416
CrossesTrib. to Box Elder Creek
Location8.1E New Underwood
RouteCounty Highway 0
Coordinates44.09617, -102.66481
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.8 US tons
Inventory rating18.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span10 ft (3 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic115 (2022)
Projected traffic115 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 1416 over Trib. to Box Elder Creek built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 2009.

What condition is HWY 1416 over Trib. to Box Elder Creek 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 June 2023.

How much traffic does HWY 1416 over Trib. to Box Elder Creek carry?

About 115 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is HWY 1416 over Trib. to Box Elder Creek?

The structure is 34 ft (10.4 m) long with a longest span of 10 ft (3 m) and a deck 33 ft wide.

Who owns HWY 1416 over Trib. to Box Elder Creek?

It is owned by the County Highway Agency.