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Bridge conditions in Perkins County, South Dakota

60 inventoried bridges · 3 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Perkins County tracks close to typical: 3 of its 60 inventoried bridges (5.0%) are rated poor, against a national rate of about 7%.

3 of the 60 bridges in Perkins County, South Dakota, are rated in poor condition (5.0%) in the 2025 National Bridge Inventory, as of August 20, 2026.
32 bridges (53.3%) are rated good and 25 (41.7%) fair.
The median Perkins County bridge was built in 1995.
The busiest poor-rated bridge is White Butte Road over Lodgepole Ck (built 1965), carrying about 163 vehicles a day.

Good 53.3% · Fair 41.7% · Poor 5.0% of 60 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Bridge	Built	Vehicles/day	Condition
White Butte Road over Lodgepole Ck	1965	163	Poor
Haynes Road over Lodge Pole Ck	1980	26	Poor
Chance Road over Rabbit Ck	1950	26	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
SD073 over East Flat Ck	2018	663	Good
SD073 over Flat Ck	1995	663	Good
SD073 over Grand Rv	1995	663	Fair
SD073 over Moreau Rv	2016	425	Good
SD073 over Flint Rock Ck	2016	425	Good
SD073 over Thunder Butte Ck	2005	423	Good
SD020 over Thunder Butte Ck	1983	408	Good
SD020 over Ck	2008	380	Good
SD020 over Ck	2008	380	Good
SD020 over Thunder Butte Ck	2008	380	Good

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

All of South Dakota: South Dakota bridge conditions by county · every download on the data page.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.