NOAA S-57 chart cell
Mississippi River, Lake Pontchartrain, and Lake Maurepas
US4LA1HL
- Usage band
- Approach · code 4
- Current edition
- 1.2
- Features
- 751
- S-57 layers
- 51
- Published
- Jan 13, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 30.30000° N
- South
- 30.00000° N
- West
- 90.60000° W
- East
- 90.30000° W
- Center
- 30.15000° N, 90.45000° W
- Bounds area
- 281 sq nm
- Feature density
- 2.6769 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 14.7
- Smallest layer
- 1
- Largest layer
- 76
- Area sq km
- 962
- Features per sq km
- 0.78047
- LIGHTS Light 76
- DEPCNT Depth contour 63
- DEPARE Depth area 56
- SBDARE Seabed area 48
- COALNE Coastline 43
- SLCONS Shoreline construction 41
- BCNLAT Lateral beacon 38
- BCNSPP Special purpose beacon 38
- LNDRGN Land region 24
- SILTNK 23
- OBSTRN Obstruction 20
- SEAARE Sea area 18
- WRECKS Wreck 18
- DAYMAR 17
- MORFAC 17
- BUAARE 15
- BUISGL 15
- M_QUAL Data quality 13
- SOUNDG Sounding 12
- CANALS 11
Nearby Chart Cells
Approach usage band
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.
- Original NOAA ZIP archive https://www.charts.noaa.gov/ENCs/US4LA1HL.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4LA1HL/1.2/US4LA1HL.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4LA1HL/1.2/US4LA1HL.001
- S-57 update 002 https://charts.openships.ai/noaa/s57/approach/US4LA1HL/1.2/US4LA1HL.002
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4LA1HL/1.2/US4LA1HL.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4LA1HL/1.2/US4LA1HL.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4LA1HL/1.2/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.2 | Jan 13, 2026 | metadata.json |