NOAA S-57 chart cell

Lake Pontchartrain

US4LA1IM

Usage band
Approach · code 4
Current edition
2.1
Features
350
S-57 layers
43
Published
Aug 21, 2025
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
30.60000° N
South
30.30000° N
West
90.30000° W
East
90.00000° W
Center
30.45000° N, 90.15000° W
Bounds area
280 sq nm
Feature density
1.2514 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
8.1
Smallest layer
1
Largest layer
44
Area sq km
959
Features per sq km
0.36485
  1. LIGHTS Light 44
  2. BCNSPP Special purpose beacon 36
  3. COALNE Coastline 31
  4. SBDARE Seabed area 26
  5. DAYMAR 23
  6. SLCONS Shoreline construction 19
  7. LNDRGN Land region 18
  8. BCNLAT Lateral beacon 16
  9. CBLOHD 12
  10. OBSTRN Obstruction 12
  11. WRECKS Wreck 12
  12. DEPARE Depth area 10
  13. BRIDGE 9
  14. DEPCNT Depth contour 8
  15. PILPNT 7
  16. CTNARE Caution area 6
  17. DRGARE 6
  18. RIVERS River 6
  19. SILTNK 5
  20. BUAARE 4

Nearby Chart Cells

Approach usage band

  1. Lake Maurepas US4LA1IL - about 16 nm away
  2. West Pearl River and Lacombe Bayou US4LA1IN - about 16 nm away
  3. Lake Pontchartrain US4LA1HM - about 18 nm away
  4. Mississippi River, Lake Pontchartrain, and Lake Maurepas US4LA1HL - about 24 nm away
  5. Gulf Intracoastal Waterway - Lake Borgne and Lake Pontchartrain US4LA1HO - about 24 nm away
  6. Pearl River US4MS1CC - about 31 nm away

Current Edition Files

The NOAA ZIP archive is the upstream source for this chart cell; the other files are Open Ships generated derivatives for web and GIS use.

Editions

Edition Published Metadata
2.1 Aug 21, 2025 metadata.json