Martin County Bridge Report Card

Martin County scores 94 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

A94 / 100

Local infrastructure snapshot

Martin County, Florida

Martin County has 129 bridges in the National Bridge Inventory, with 1 rated poor and 3 rated scour-critical. Its poor-condition share of 0.8% is at or below the 2.8% statewide average. Poor-condition bridges carry about 3,500 daily vehicle crossings.

129Total Bridges

1Poor (0.8%)

34Fair (26.4%)

3Scour-Critical

Quote-Ready Local Facts

0.8%of county bridges are in poor condition, compared with 2.8% statewide and 6.7% nationally.

3,500daily vehicle crossings are on poor-condition bridges in the county.

3bridges are rated scour-critical, or 2.3% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Martin County a Bridge Condition Exposure Score of 94/100 (A). The county has 129 bridges in the National Bridge Inventory, including 1 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 3,500 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	0.8%	1.6
Poor-condition traffic exposure	25	0.1% of measured traffic	0.1
Scour-critical bridge share	20	2.3%	4.7
Average age vs national baseline	10	43 years vs 48 nationally	0.0
Traffic-data completeness	5	2,649,046 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	0.8%
State Poor-Condition Share	2.8%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.3%
Average Bridge Age	43 years
Poor-Condition Traffic Exposure	3,500 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeSE County Line RD over N Fork Loxahatchee River — 3,500 vehicles/day Oldest Listed BridgeUs-1 (sr-5) SB over Drainage Ditch — built in 1935 All County BridgesBrowse every bridge record in Martin County.

Top Bridges to Watch in Martin County

Bridge	Reason	Condition	Daily Traffic	Year Built
SE County Line RD over N Fork Loxahatchee River	Poor condition + traffic exposure	Poor	3,500	1974
Jensen Bch. Cswy. over W. Relief Indian River	Scour-critical foundation rating	Fair	11,500	1987
Cr708 SE Bridge RD over Intracoastal Waterway	Scour-critical foundation rating	Fair	10,502	1985
Cr-76a over ST Lucie Canal	Scour-critical foundation rating	Good	3,100	1980
I-95 (sr-9) over Drainage Ditch	High traffic	Good	111,500	1987
Sr-9(i-95) over Drainage Ditch	High traffic	Good	103,500	1987
I-95 (sr-9) over Hanson Grant Outlet	High traffic	Fair	74,500	1987
SR 91 Tpk 137.25 over Drainage Ditch	High traffic	Good	59,900	1957
Sr91 N/s Tpk 138.1 over County Line Canal C-23	High traffic	Fair	59,900	1957
Sr91 N/s Tpk 135.6 over Bessey Creek	High traffic	Fair	59,900	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.