Hamlin County Bridge Report Card

Hamlin County scores 67 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D67 / 100

Local infrastructure snapshot

Hamlin County, South Dakota

Hamlin County has 61 bridges in the National Bridge Inventory, with 7 rated poor and 3 rated scour-critical. Its poor-condition share of 11.5% is at or below the 16.1% statewide average. Poor-condition bridges carry about 424 daily vehicle crossings.

61Total Bridges

7Poor (11.5%)

28Fair (45.9%)

3Scour-Critical

Quote-Ready Local Facts

11.5%of county bridges are in poor condition, compared with 16.1% statewide and 6.7% nationally.

424daily vehicle crossings are on poor-condition bridges in the county.

3bridges are rated scour-critical, or 4.9% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Hamlin County a Bridge Condition Exposure Score of 67/100 (D). The county has 61 bridges in the National Bridge Inventory, including 7 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 424 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	11.5%	23.0
Poor-condition traffic exposure	25	0.8% of measured traffic	0.6
Scour-critical bridge share	20	4.9%	9.8
Average age vs national baseline	10	47 years vs 48 nationally	0.0
Traffic-data completeness	5	50,303 measured daily crossings	0.0

Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.

County Comparisons

County Poor-Condition Share	11.5%
State Poor-Condition Share	16.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	4.9%
Average Bridge Age	47 years
Poor-Condition Traffic Exposure	424 vehicles/day

Bridges to Watch

Busiest Poor-Condition Bridge180th Street over Big Sioux River — 135 vehicles/day Oldest Listed Bridge179 Street over Stray Horse Ck — built in 1910 All County BridgesBrowse every bridge record in Hamlin County.

Top Bridges to Watch in Hamlin County

Bridge	Reason	Condition	Daily Traffic	Year Built
180th Street over Big Sioux River	Poor condition + traffic exposure	Poor	135	1930
192nd Street over Hidewood Creek	Poor condition + traffic exposure	Poor	115	1930
460th Avenue over Lake Poinsett Outlet	Poor condition + traffic exposure	Poor	66	1960
190th Street over Hidewood Creek	Poor condition + traffic exposure	Poor	40	1965
194th Street over Dolph Creek	Poor condition + traffic exposure	Poor	38	1960
180th Street over Trib. To Big Sioux River	Poor condition + traffic exposure	Poor	25	1930
179 Street over Stray Horse Ck	Poor condition + traffic exposure	Poor	5	1910
Sd028 over Lake Norden Outlet	Scour-critical foundation rating	Fair	1,862	1949
Sd028 over Big Sioux Rv	Scour-critical foundation rating	Fair	1,371	1951
Sd022 over Stray Horse Ck	Scour-critical foundation rating	Fair	917	1957

Important safety note

Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.