NOAA S-57 chart cell

Lake Michigan - Chicago Harbor to Chicago River, IL

US4IL1XX

Usage band
Approach · code 4
Current edition
2.3
Features
793
S-57 layers
38
Published
Apr 22, 2026
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
42.00000° N
South
41.70000° N
West
87.90000° W
East
87.60000° W
Center
41.85000° N, 87.75000° W
Bounds area
242 sq nm
Feature density
3.2813 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
20.9
Smallest layer
1
Largest layer
167
Area sq km
829
Features per sq km
0.95668
  1. BRIDGE 167
  2. SLCONS Shoreline construction 111
  3. DEPARE Depth area 91
  4. DEPCNT Depth contour 83
  5. PONTON 81
  6. COALNE Coastline 34
  7. LIGHTS Light 34
  8. LNDMRK 26
  9. CBLOHD 21
  10. BCNLAT Lateral beacon 14
  11. OBSTRN Obstruction 14
  12. SEAARE Sea area 14
  13. M_QUAL Data quality 12
  14. BCNSPP Special purpose beacon 9
  15. BUISGL 9
  16. LNDARE Land area 9
  17. SBDARE Seabed area 8
  18. BUAARE 6
  19. DAYMAR 6
  20. LNDRGN Land region 5

Nearby Chart Cells

Approach usage band

  1. Lake Michigan - Calumet River to Chicago Harbor Entrance, IL US4IL1XY - about 13 nm away
  2. Lake Michigan - North Shore Channel to Lake Forest, IL US4IL1YX - about 18 nm away
  3. Lake Michigan - Little Calumet River, IL US4IL1WX - about 18 nm away
  4. Lake Michigan - Offshore of Evanston, IL US4IL1YY - about 22 nm away
  5. Lake Michigan - Indiana Harbor to Gary Harbor, IN US4IN1CC - about 22 nm away
  6. Lake Michigan - North of Burns International Harbor, IN US4IN1DD - about 27 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
2.3 Apr 22, 2026 metadata.json