Monroe County, FL

100 public highway bridges

Monroe County Bridge Snapshot

Monroe County, Florida contains 100 public highway bridges in the FHWA National Bridge Inventory. Roughly 33% are rated “Good,” 58% “Fair,” 7% “Poor,” and 7% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in FL are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

100
Total Bridges
33%
Good
7%
Poor
7%
Structurally Deficient

Condition Distribution

Good
33% (33)
Fair
58% (58)
Poor
7% (7)
SD
7% (7)

All Bridges (100)

US 1 (SR 5)

Fair

Over: INDIAN KEY CHANNEL

MATECUMBE KEY (MM 78.0), Monroe, FL

Built 1981 Load: 43.5 t ADT: 15,800

US-1 (SR-5)

Fair

Over: VACA CUT

MARATHON KEY (MM 53.2), Monroe, FL

Built 1982 Load: 43.5 t ADT: 25,000

US-1 (SR-5)

Fair

Over: OHIO MISSOURI CHANNEL

OHIO KEY (MM 39.1), Monroe, FL

Built 1981 Load: 44.7 t ADT: 11,300

US 1 (SR 5)

Fair

Over: KEMP CHANNEL

SUMMERLAND KEY (MM 23.5), Monroe, FL

Built 1982 Load: 44.8 t ADT: 16,900

US 1 (SR 5)

Fair

Over: NORTH PINE CHANNEL

BIG PINE KEY (MM 29.6), Monroe, FL

Built 1982 Load: 45.0 t ADT: 18,000

US 1 (SR 5)

Fair

Over: TEA TABLE CHANNEL

MATECUMBE KEY (MM 79.1), Monroe, FL

Built 1980 Load: 46.1 t ADT: 15,800

US 1 (SR 5)

Fair

Over: SADDLE BUNCH #4

N BOCA CHICA KEY(MM 13.1), Monroe, FL

Built 1980 Load: 47.4 t ADT: 16,900

US 1 (NB & SB)

Fair

Over: MANATEE CREEK

US 1 (MM 113), Monroe, FL

Built 2008 Load: 48.4 t ADT: 26,500

Harbour Drive

Fair

Over: Joes Canal

1.1Miles E of SR5 MM 61.1, Monroe, FL

Built 1955 Load: 65.3 t ADT: 517

Seaview Drive

Fair

Over: Duck Key Canal

1.4Miles E of US-1 MM61, Monroe, FL

Built 1955 Load: 65.3 t ADT: 530

Ramp to Pigeon Key

Good

Over: Pigeon Key

Pigeon Key, Monroe, FL

Built 1938 ADT: 101

US 1 (SR 5)

Good

Over: TOM'S HARBOR CHANNEL

DUCK KEY (MM 60.4), Monroe, FL

Built 1980 Load: 29.8 t ADT: 12,700

Watson Blvd Old

Good

Over: Watson Cut

2 miles W of SR5 MM 30.5, Monroe, FL

Built 1960 Load: 30.5 t ADT: 2,060

117th Street

Good

Over: Vaca Channel # 1

200Ft. S of US1 MM 53.1, Monroe, FL

Built 1967 Load: 32.7 t ADT: 288

WATSON RD

Good

Over: TIDAL SLOUGH

BIG PINE KEY, Monroe, FL

Built 2001 Load: 32.7 t ADT: 40

Shore Drive

Good

Over: Canal

0.2 Mile E of US1 MM17, Monroe, FL

Built 1991 Load: 33.6 t ADT: 237

Watson Blvd

Good

Over: Un-Named Channel

0.5Mi. N of Key Deer Blvd, Monroe, FL

Built 1965 Load: 35.9 t ADT: 2,060

US 1 (SR 5)

Good

Over: SADDLE BUNCH #5

N BOCA CHICA KEY(MM 12.5), Monroe, FL

Built 1980 Load: 37.0 t ADT: 16,900

US 1 NB (900130)

Good

Over: MARVIN D. ADAMS WATERWAY

KEY LARGO (MM 103.6), Monroe, FL

Built 1973 Load: 37.4 t ADT: 15,126

SR-5 (US-1)

Good

Over: Snake Creek Canal

Plantation Key (MM 85.5), Monroe, FL

Built 1981 Load: 37.6 t ADT: 20,700

US-1 NB (900125)

Good

Over: COW KEY CHANNEL

KEY WEST (MM 4.1), Monroe, FL

Built 1978 Load: 38.2 t ADT: 23,000

US 1 (SR 5)

Good

Over: ROCKLAND CHANNEL

BOCA CHICA KEY (MM 9.6), Monroe, FL

Built 1979 Load: 38.7 t ADT: 47,000

US 1 NB (900003)

Good

Over: BOCA CHICA CHANNEL

BOCA CHICA KEY (MM 6.0), Monroe, FL

Built 1982 Load: 39.4 t ADT: 13,500

US 1 (SR 5)

Good

Over: JEWFISH CREEK

NB OFF RAMP TO ROTARY, Monroe, FL

Built 2008 Load: 39.6 t ADT: 100

US 1 (SR 5)

Good

Over: JEWFISH CREEK

NB OFF RAMP TO US-1, Monroe, FL

Built 2008 Load: 39.6 t ADT: 80

Palm Drive

Good

Over: Bay Point Canal

0.3 Mile E of US-1 MM14.8, Monroe, FL

Built 1975 Load: 39.8 t ADT: 593

US 1 (SR 5)

Good

Over: LIGNUMVITAE CHANNEL

MATECUMBE KEY (MM 77.5), Monroe, FL

Built 1981 Load: 40.3 t ADT: 15,800

SR-A1A (Key West)

Good

Over: RIVIERA CANAL

SR A1A (MM 2.5), Monroe, FL

Built 1960 Load: 40.5 t ADT: 12,300

US 1 (SR 5)

Good

Over: HARRIS GAP CHANNEL

SUGARLOAF KEY (MM 17.5), Monroe, FL

Built 1982 Load: 40.5 t ADT: 17,600

US 1 SB (900073)

Good

Over: MARVIN D. ADAMS WATERWAY

KEY LARGO (MM 103.6), Monroe, FL

Built 1993 Load: 40.6 t ADT: 15,126

US 1 (SR 5)

Good

Over: PARK CHANNEL

SUGARLOAF KEY (MM 18.6), Monroe, FL

Built 1982 Load: 41.7 t ADT: 17,600

US 1 (SR 5)

Good

Over: JEWFISH CREEK

SB ON RAMP TO US-1, Monroe, FL

Built 2008 Load: 43.4 t ADT: 150

US 1 (SR 5)

Good

Over: JEWFISH CREEK

SB OFF RAMP TO ROTARY, Monroe, FL

Built 2007 Load: 43.5 t ADT: 60

US 1(SR 5)FRNTG RD

Good

Over: CROCODILE CROSSING

JUST N/O JEWFISH CREEK, Monroe, FL

Built 2008 Load: 44.1 t ADT: 400

US 1 (SR 5)

Good

Over: SOUTH PINE CHANNEL

N OF TORCH KEY (MM 28.8), Monroe, FL

Built 1982 Load: 45.0 t ADT: 18,000

Bimini Drive

Good

Over: Sams Canal

1Mile E of SR5 at MM 61.1, Monroe, FL

Built 1955 Load: 45.1 t ADT: 539

US 1 (SR 5)

Good

Over: JEWFISH CREEK

US 1 (M.M. 107), Monroe, FL

Built 2008 Load: 47.0 t ADT: 26,500

US 1 (SR 5)

Good

Over: SADDLE BUNCH #3 CHANNEL

N BOCA CHICA KEY (MM14.2), Monroe, FL

Built 1981 Load: 47.4 t ADT: 17,600

US-1 (SR 5)

Good

Over: WHALE HARBOR

ISLAMORADA KEY (MM 83.8), Monroe, FL

Built 1951 Load: 48.6 t ADT: 20,700

US-1 SB (900086)

Good

Over: COW KEY CHANNEL

KEY WEST (MM 4.1), Monroe, FL

Built 1985 Load: 49.4 t ADT: 23,000

US 1 (SR 5)

Good

Over: FIRST DEER CROSSING

BIG PINE KEY (MM 31.4), Monroe, FL

Built 2002 Load: 52.5 t ADT: 13,200

US 1 (SR 5)

Good

Over: SECOND DEER CROSSING

BIG PINE KEY (MM 32.4), Monroe, FL

Built 2002 Load: 52.5 t ADT: 13,200

US 1 SB (900078)

Good

Over: TAVERNIER CREEK

TAVERNIER KEY (MM 90.8), Monroe, FL

Built 1993 Load: 56.0 t ADT: 15,000

PIGEON KEY ACCESS

Poor

Over: KNIGHT CHANNEL

MARATHON KEY (MM 47), Monroe, FL

Built 1912

CR-941 Boca Chica

Poor

Over: Similar Sound Local Cnl

0.6 Mile E of US1 MM 10.7, Monroe, FL

Built 1957 Load: 28.8 t ADT: 2,230

CR-939B

Poor

Over: Unnamed Sugarloaf Canal

0.3 Mile S of CR-939A, Monroe, FL

Built 1968 Load: 30.8 t ADT: 2

CR939 Sugarloaf B.

Poor

Over: Un-Named Channel

0.8 Mile E of US-1 MM 17, Monroe, FL

Built 1961 Load: 31.5 t ADT: 592

117th Street

Structurally Deficient

Over: Vaca Channel #2

450Ft. S of US-1 MM53.1, Monroe, FL

Built 1967 Load: 7.5 t ADT: 294

Card Sound Road

Structurally Deficient

Over: Mosquito Creek

3.8 Miles N of CR905, Monroe, FL

Built 1969 Load: 10.4 t ADT: 3,182

Card Sound Road

Structurally Deficient

Over: Tubbys Creek

3.1 Miles N of CR905, Monroe, FL

Built 1969 Load: 18.3 t ADT: 3,182

Read our methodology — how this data is sourced, computed, and verified.

Related

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial