St. Tammany County, LA

360 public highway bridges

St. Tammany County Bridge Snapshot

St. Tammany County, Louisiana contains 360 public highway bridges in the FHWA National Bridge Inventory. Roughly 29.7% are rated “Good,” 53.1% “Fair,” 5.6% “Poor,” and 5.6% 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 LA 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.

360

Total Bridges

29.7%

Good

5.6%

Poor

5.6%

Structurally Deficient

Condition Distribution

Good

29.7% (107)

Fair

53.1% (191)

Poor

5.6% (20)

SD

5.6% (20)

All Bridges (360)

Sort:

LA1088

Over: I 12

3.4 Mi NE of LA 59, St. Tammany, LA

US0190

Over: LA 22

2.4 Mi S of I-12, St. Tammany, LA

US0190-B

Over: INTERSTATE 10

1.85 MILES EAST OF JCT US, St. Tammany, LA

US0190

Over: US190B/LA21/Bouge Falaya

US0190, St. Tammany, LA

OAK HARBOR BLVD

Over: I-10

1.0M N LAKE PONTCHARTRAIN, St. Tammany, LA

I0010

Over: LA 433

8.8 Mi NE of US 11, St. Tammany, LA

I0010

Over: LA 433

1.6 MI S OF US 190, St. Tammany, LA

I0010

Over: US 190

1 Mi N of US 190-B, St. Tammany, LA

I0010

Over: US 190

1.5 MI S OF I-12, St. Tammany, LA

I0010

Over: I-10 OVER I-59 NB LANE

I0010, St. Tammany, LA

BROWNSWITCH RD

Over: I-59

0.4 MI E OF LA 1091, St. Tammany, LA

I0059

Over: WEST PEARL RIVER

5.2 MI NO I-10 & I-59 INT, St. Tammany, LA

I0059

Over: WEST PEARL RIVER

5.2 MI NO.I-12 & I-10 INT, St. Tammany, LA

I0059

Over: E. PEARL RIV,FRONTAGE RD

8.2 Mi N OF US 11, St. Tammany, LA

I0059

Over: E. PEARL RIV,FRONTAGE RD

0.6 MI SW of US 11, St. Tammany, LA

I0012

Over: I-12 OVER LA 21

2.2 M E OF LA 1077, St. Tammany, LA

I0012

Over: I-12 OVER LA 21

2.2 M E OF LA 1077, St. Tammany, LA

I0012

Over: I12 OVER US 190

2.6 M W OF LA 59, St. Tammany, LA

I0012

Over: US 190

2.6 M W OF LA 59, St. Tammany, LA

I0012 RAMP A

Over: US 190

2.6 M W OF LA 59, St. Tammany, LA

I0012 RAMP B

Over: US 190

2.6 M W OF LA 59, St. Tammany, LA

I0012

Over: LA 59

2.7 M E OF US 190, St. Tammany, LA

I0012

Over: LA 59

2.7 M E OF US 190, St. Tammany, LA

FISH HATCHERY RD.

Over: I-12

1.0 M W OF LA 434, St. Tammany, LA

DIXIE RANCH RD.

Over: I-12

4.2 M E OF LA 434, St. Tammany, LA

AIRPORT ROAD

Over: I-12

6.2 M E OF LA 434, St. Tammany, LA

I0012

Over: DONYA ST/CANAL

I0012, St. Tammany, LA

I0012

Over: I-12 OVER US 11

I0012, St. Tammany, LA

I0012

Over: I-12 OVER US 11

I0012, St. Tammany, LA

I0012

Over: I-12 OVER I-59 SB

I0012, St. Tammany, LA

I0012

Over: I-12 OVER I-59 SB

I0012, St. Tammany, LA

I0012

Over: I-12 RAMP OVER I-59 SB

I0012, St. Tammany, LA

I0012

Over: I-12 OVER I-59 NB

I0012, St. Tammany, LA

I0012

Over: I-12 OVER I-59 NB

I0012, St. Tammany, LA

I0012

Over: I-12 OVER I-10

I0010, St. Tammany, LA

LA1085

Over: LA 1085 OVER I-12

LA1085, St. Tammany, LA

LA1077

Over: LA 1077 OVER I-12

LA1077, St. Tammany, LA

LA1088

Over: I-12

2.5 M E OF LA 59, St. Tammany, LA

LA0434

Over: I-12

2.6 MI N OF US 190, St. Tammany, LA

LA1091

Over: LA 1091 OVER I-12

LA1091, St. Tammany, LA

LA1090

Over: I-10

0.7 M N OF US 190, St. Tammany, LA

LA1090

Over: LA 1090 OVER I-59

LA1090, St. Tammany, LA

LA0434

Over: BAYOU LACOMBE

2.5 Miles South of LA 36, St. Tammany, LA

Built 1953 Load: 6.4 t ADT: 3,690

Smith Rd

Over: LITTLE BOGUE FALAYA RIVE

1.2 MI N/W JCT LA1082 &21, St. Tammany, LA

Built 2001 Load: 7.5 t ADT: 2,253

LA0036

Over: BAYOU LACOMBE

LA0036, St. Tammany, LA

Built 1955 Load: 9.1 t ADT: 2,206

Corin Pkwy.

Over: BAYOU

CITY OF MANDEVILLE, St. Tammany, LA

Built 1960 Load: 9.1 t ADT: 100

Hickory Dr

Over: CANAL/CREEK

0.2M EAST OF PONTCHR, St. Tammany, LA

Built 1964 Load: 9.4 t ADT: 983

LA0040

Over: MORGAN BRANCH

1.0 M E OF LA 1077, St. Tammany, LA

Built 1954 Load: 10.0 t ADT: 3,755

Bruhl Rd

Over: BOGUE FALAYA RIVER

1.5 M EAST OF LA 25, St. Tammany, LA

Built 1990 Load: 10.0 t ADT: 150

Carrey St

Over: CREEK

0.35 MI NE OF US 11, St. Tammany, LA

Built 1960 Load: 10.4 t

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

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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 5, 2026