Dickinson County Bridge Report Card

Dickinson County scores 51 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F51 / 100

Local infrastructure snapshot

Dickinson County, Iowa

Dickinson County has 83 bridges in the National Bridge Inventory, with 13 rated poor and 3 rated scour-critical. Its poor-condition share of 15.7% is at or below the 18.6% statewide average. Poor-condition bridges carry about 10,180 daily vehicle crossings.

83Total Bridges

13Poor (15.7%)

33Fair (39.8%)

3Scour-Critical

Quote-Ready Local Facts

15.7%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

10,180daily vehicle crossings are on poor-condition bridges in the county.

3bridges are rated scour-critical, or 3.6% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Dickinson County a Bridge Condition Exposure Score of 51/100 (F). The county has 83 bridges in the National Bridge Inventory, including 13 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 10,180 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	15.7%	31.3
Poor-condition traffic exposure	25	13.6% of measured traffic	10.2
Scour-critical bridge share	20	3.6%	7.2
Average age vs national baseline	10	42 years vs 48 nationally	0.0
Traffic-data completeness	5	74,668 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	15.7%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	3.6%
Average Bridge Age	42 years
Poor-Condition Traffic Exposure	10,180 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeIa 9 over W Fork Little Sioux Rvr — 4,310 vehicles/day Oldest Listed BridgeLocal over Little Sioux — built in 1920 All County BridgesBrowse every bridge record in Dickinson County.

Top Bridges to Watch in Dickinson County

Bridge	Reason	Condition	Daily Traffic	Year Built
Local over Little Sioux	Poor condition + traffic exposure	Poor	31	1920
Ia 9 over W Fork Little Sioux Rvr	Poor condition + traffic exposure	Poor	4,310	1929
FM over Creek	Poor condition + traffic exposure	Poor	2,060	1941
FM over Little Sioux River	Poor condition + traffic exposure	Poor	1,076	1979
FM over Dugout Creek	Poor condition + traffic exposure	Poor	843	1970
N14 (310th Ave) over Drainage Ditch	Poor condition + traffic exposure	Poor	803	1948
FM over Little Sioux	Poor condition + traffic exposure	Poor	319	1969
FM over Stony Creek	Poor condition + traffic exposure	Poor	315	1990
FM A-31 over Drainage Ditch	Poor condition + traffic exposure	Poor	305	1994
FM over W Br Little Sioux	Poor condition + traffic exposure	Poor	61	1977

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.