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Every bridge in Gregory County, South Dakota

Name: Every bridge in Gregory County, South Dakota
Creator: Bridge Report Card
License: https://creativecommons.org/publicdomain/zero/1.0/

51 inventoried bridges, busiest first

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

Gregory County, South Dakota, has 51 bridges in the 2025 National Bridge Inventory: 15 rated good, 31 fair, and 5 poor (as of August 20, 2026).
This index lists every one of them, busiest first; each links to its own condition record.

Bridge	Built	Vehicles/day	Condition
345 Avenue over South Fork Whetstone Ck	2001	560	Good
SD047 over Ck	1957	552	Fair
SD047 over Ck	1957	552	Fair
SD044 over Bull Ck	1971	540	Good
SD044 over Ck	1971	540	Fair
SD044 over Dixon Ck	1971	540	Fair
SD044 over Lone Tree Ck	1971	540	Fair
SD044 over Ck	1964	504	Good
SD251 over Masdon Ck	1996	400	Good
SD251 over Ponca Ck	1984	400	Good
SD047 over Ck	1961	326	Fair
SD047 over Ponca Ck	1961	326	Fair
354 Avenue over Ponca Ck	1952	189	Poor
SD1806 over Whetstone Ck	1977	157	Good
294 Street over Ponca Ck	1950	140	Fair
333 Avenue over Ck	1955	135	Fair
349 Avenue over Ponca Ck	1949	120	Fair
333 Avenue over Bull Ck	1965	114	Fair
333 Avenue over Bull Ck	1958	99	Fair
333 Avenue over Bull Ck	1965	96	Fair
290 Street over South Fork Whetstone Ck	1949	65	Fair
361 Avenue over Ck	1978	65	Good
Randall Road over Randall Ck	2003	65	Good
State Park Rd over Randall Ck	2020	50	Fair
State Park Rd over South Scalp Ck	1963	50	Poor
279 Street over Ck	2018	36	Good
281 Street over Bull Creek	2001	36	Good
298 Street over Willow Ck	1930	36	Fair
333 Avenue over Bull Ck	1965	36	Fair
342 Avenue over Ck	1932	36	Good
342 Avenue over Ponca Ck	2007	36	Good
347 Avenue over Ck	1988	36	Fair
349 Avenue over South Fork Whetstone Ck	1997	36	Fair
352 Avenue over Squaw Ck	1956	36	Fair
352 Avenue over Willow Ck	1956	36	Poor
355 Avenue over Ponca Ck	1991	36	Fair
366 Avenue over North Scalp Ck	2015	36	Poor
Fort Randall Road over Randall Ck	1985	36	Fair
Lodge Road over Randall Ck	1984	36	Fair
Randall Road over Randall Ck	1992	36	Good
295 Street over Ponca Ck	1982	35	Fair
W. Whetstone Road over North Fork Whetstone Ck	1982	32	Fair
359 Avenue over Whetstone Ck	2003	30	Good
371 Avenue over South Scalp Ck	1977	23	Fair
371 Avenue over South Scalp Ck	1977	23	Fair
358 Avenue over North Fork Whetstone Ck	2001	20	Good
335 Ave over Creek	2004	16	Fair
335 Avenue over Ck	2023	15	Fair
355 Ave over Squaw Ck	2005	12	Fair
297 Street over Ck	1920	10	Poor
350 Avenue over Coon Ck	1949	10	Fair

Source: FHWA National Bridge Inventory, 2025.

Gregory County bridge conditions · South Dakota bridges by county.

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