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Bridge conditions in Roberts County, South Dakota

158 inventoried bridges · 40 rated poor · 2025 National Bridge Inventory

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

Of the 158 Roberts County bridges in the federal inventory, 40 carry a poor rating. That 25.3% share is roughly 4x the national average.

40 of the 158 bridges in Roberts County, South Dakota, are rated in poor condition (25.3%) in the 2025 National Bridge Inventory, as of August 20, 2026.
41 bridges (25.9%) are rated good and 77 (48.7%) fair.
The median Roberts County bridge was built in 1977.
The busiest poor-rated bridge is Irr SD127 over Little Minnesota Rv (built 1953), carrying about 872 vehicles a day.

Good 25.9% · Fair 48.7% · Poor 25.3% of 158 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
Irr SD127 over Little Minnesota Rv	1953	872	Poor
Irr SD127 over Big Slough Ck	1955	354	Poor
105 St over Bois De Sioux R	1930	200	Poor
101ST Street over Creek	1929	144	Poor
118TH Street over Little Minnesota River	1939	68	Poor
141ST Street over Creek	1969	68	Poor
468TH Avenue over Creek	1901	50	Poor
471ST Avenue over Creek	1934	50	Poor
466TH Avenue over Creek	1940	38	Poor
141ST Street over N. Fork Whetstone Rv	1935	38	Poor
450TH Avenue over Little Minnesota River	1950	35	Poor
104TH Street over Little Minnesota River	1967	35	Poor
112TH Street over Little Minnesota River	1974	35	Poor
466TH Avenue over Creek	1935	35	Poor
138TH Street over N. Fork Whetstone Rv	1965	35	Poor
466TH Avenue over Creek	1940	32	Poor
465TH Avenue over Creek	1945	31	Poor
465TH Avenue over Creek	1945	31	Poor
107TH Street over Little Minnesota River	1950	30	Poor
463RD Avenue over Creek	1929	30	Poor
463RD Avenue over Creek	1966	30	Poor
134TH Street over N. Fork Whetstone Rv	1960	30	Poor
117TH Street over Jim Creek	1929	30	Poor
474TH Avenue over Big Slough Creek	1960	30	Poor
451ST Avenue over Creek	1940	29	Poor
468TH Avenue over N. Fork Whetstone Rv	1940	28	Poor
454TH Avenue over Creek	1950	25	Poor
105TH Street over Little Minnesota River	1967	25	Poor
475TH Avenue over N. Fork Whetstone Rv	1967	25	Poor
477TH Avenue over Creek	1966	25	Poor
460TH Avenue over Big Coulee Creek	1950	22	Poor
476TH Avenue over Big Slough Creek	1930	22	Poor
477TH Avenue over Big Slough Creek	1955	22	Poor
117TH Street over Creek	1965	20	Poor
464TH Avenue over N. Fork Whetstone Rv	1929	20	Poor
464TH Avenue over Creek	1950	20	Poor
468TH Avenue over Creek	1967	20	Poor
469TH Avenue over Creek	1935	17	Poor
138TH Street over Creek	1938	10	Poor
139TH Street over Creek	1968	5	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
Irr SD010 over Ck	2019	7,072	Good
Irr SD010 over Ck	1979	6,275	Fair
458TH Avenue over Creek	1941	5,850	Fair
458TH Avenue over Creek	1941	5,850	Fair
459TH Avenue over Creek	1941	5,850	Good
Irr I029 over Big Spring Ck	1978	5,340	Fair
Irr I029 over Ck	1978	5,340	Fair
Irr I029 over Twin City RR	1982	4,890	Fair
Irr I029 over Hines Ck	1978	4,890	Fair
Irr I029 S over Burlington Northern RR	1979	3,650	Fair

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

Every bridge in Roberts County → - all 158, busiest first, each with its own condition record.

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.