Alpena County Bridge Report Card

Alpena County scores 62 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D62 / 100

Local infrastructure snapshot

Alpena County, Michigan

Alpena County has 32 bridges in the National Bridge Inventory, with 2 rated poor and 8 rated scour-critical. Its poor-condition share of 6.2% is at or below the 11.0% statewide average. Poor-condition bridges carry about 3,011 daily vehicle crossings.

32Total Bridges

2Poor (6.2%)

19Fair (59.4%)

8Scour-Critical

Quote-Ready Local Facts

6.2%of county bridges are in poor condition, compared with 11.0% statewide and 6.7% nationally.

3,011daily vehicle crossings are on poor-condition bridges in the county.

8bridges are rated scour-critical, or 25.0% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Alpena County a Bridge Condition Exposure Score of 62/100 (D). The county has 32 bridges in the National Bridge Inventory, including 2 in poor condition and 8 rated scour-critical. Poor-condition bridges carry about 3,011 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	6.2%	12.5
Poor-condition traffic exposure	25	2.9% of measured traffic	2.1
Scour-critical bridge share	20	25.0%	20.0
Average age vs national baseline	10	56 years vs 48 nationally	3.1
Traffic-data completeness	5	105,328 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	6.2%
State Poor-Condition Share	11.0%
National Poor-Condition Share	6.7%
County Scour-Critical Share	25.0%
Average Bridge Age	56 years
Poor-Condition Traffic Exposure	3,011 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeM-65 over Thunder Bay River — 1,861 vehicles/day Oldest Listed BridgeM-32 over S Br Thunder Bay River — built in 1931 All County BridgesBrowse every bridge record in Alpena County.

Top Bridges to Watch in Alpena County

Bridge	Reason	Condition	Daily Traffic	Year Built
M-65 over Thunder Bay River	Poor condition + traffic exposure	Poor	1,861	1953
5long Rapids Road over N Br Thunder Bay River	Poor condition + traffic exposure	Poor	1,150	1978
Us-23 over Thunder Bay River	Scour-critical foundation rating	Fair	16,200	1932
Us-23 over N Br Devil River	Scour-critical foundation rating	Fair	5,537	1933
M-32 over Bean Creek	Scour-critical foundation rating	Fair	5,505	1934
Hubbard Lake Road over Lwr S Br Thunder Bay Riv	Scour-critical foundation rating	Fair	1,650	1948
Wolf Creek Road over Wolf Creek	Scour-critical foundation rating	Fair	500	1957
Beaver Lake Road over Wolf Creek	Scour-critical foundation rating	Good	300	1960
State Street over Devils River	Scour-critical foundation rating	Fair	250	1957
Second Avenue over Thunder Bay River	High traffic	Fair	15,700	1939

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.