Iosco County Bridge Report Card

Iosco County scores 61 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D61 / 100

Local infrastructure snapshot

Iosco County, Michigan

Iosco County has 47 bridges in the National Bridge Inventory, with 3 rated poor and 13 rated scour-critical. Its poor-condition share of 6.4% is at or below the 11.0% statewide average. Poor-condition bridges carry about 7,683 daily vehicle crossings.

47Total Bridges

3Poor (6.4%)

32Fair (68.1%)

13Scour-Critical

Quote-Ready Local Facts

6.4%of county bridges are in poor condition, compared with 11.0% statewide and 6.7% nationally.

7,683daily vehicle crossings are on poor-condition bridges in the county.

13bridges are rated scour-critical, or 27.7% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Iosco County a Bridge Condition Exposure Score of 61/100 (D). The county has 47 bridges in the National Bridge Inventory, including 3 in poor condition and 13 rated scour-critical. Poor-condition bridges carry about 7,683 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	6.4%	12.8
Poor-condition traffic exposure	25	7.0% of measured traffic	5.3
Scour-critical bridge share	20	27.7%	20.0
Average age vs national baseline	10	51 years vs 48 nationally	1.4
Traffic-data completeness	5	109,604 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	6.4%
State Poor-Condition Share	11.0%
National Poor-Condition Share	6.7%
County Scour-Critical Share	27.7%
Average Bridge Age	51 years
Poor-Condition Traffic Exposure	7,683 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeM-65 over Johnson Creek — 4,353 vehicles/day Oldest Listed BridgeM-55 over Hope Creek — built in 1928 All County BridgesBrowse every bridge record in Iosco County.

Top Bridges to Watch in Iosco County

Bridge	Reason	Condition	Daily Traffic	Year Built
M-65 over Johnson Creek	Poor condition + traffic exposure	Poor	4,353	1950
M-55 over E Br Au Gres River	Poor condition + traffic exposure	Poor	3,110	1954
Shellenbarger Road over Smith Creek	Poor condition + traffic exposure	Poor	220	1950
Us-23 over Au Sable River	Scour-critical foundation rating	Fair	8,367	1972
Sixth Avenue over Dead Creek	Scour-critical foundation rating	Fair	2,860	1981
Whittemore Street over Tawas River	Scour-critical foundation rating	Fair	1,480	1981
Matthews Street over Tawas River	Scour-critical foundation rating	Fair	1,380	1972
Whittemore RD over Au Gres River	Scour-critical foundation rating	Fair	1,090	1975
First Street over Tawas River	Scour-critical foundation rating	Fair	950	1972
Old State RD over E Br Of Au Gres River	Scour-critical foundation rating	Fair	720	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.