Lake Peigneur
| Lake Peigneur | |
|---|---|
 |
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| Location | Iberia Parish, Louisiana |
| Coordinates | 29°58′51″N 91°59′00″W / 29.9808°N 91.9833°WCoordinates: 29°58′51″N 91°59′00″W / 29.9808°N 91.9833°W |
| Primary inflows | estimated 8.47 cu ft/s (0.240 m3/s) from catchment |
| Primary outflows | unknown to Delcambre Canal |
| Catchment area | 10.2 sq mi (26 km2) of the Vermilion-Teche Basin |
| Basin countries | United States |
| Surface area | 1,125 acres (455 ha) |
| Average depth | 3 feet (1 m) |
| Max. depth | 200 feet (61 m) |
Lake Peigneur is located in the US state of Louisiana, 1.2 miles (1.9 km) north of Delcambre and 9.1 miles (14.6 km) west of New Iberia, near the northernmost tip of Vermilion Bay.
It was a 10-foot (3 m) deep freshwater body popular with sportsmen, until an unusual man-made disaster on November 20, 1980 changed its structure and the surrounding land.
On November 20, 1980, an oil rig contracted by Texaco accidentally drilled into the Diamond Crystal Salt Company salt mine under the lake. Because of an incorrect or misinterpreted coordinate reference system (the rig was positioned as if the coordinates were in the Universal Transverse Mercator coordinate system when, in actuality, they were in transverse Mercator projection) the 14-inch (36 cm) drill bit entered the mine, starting a chain of events which turned the lake from freshwater to salt water, with a deep hole.
It is difficult to determine what occurred, as much evidence was destroyed or washed away in the ensuing maelstrom. One explanation is that a miscalculation by Texaco about their location resulted in the drill puncturing the roof of the third level of the mine. This created an opening in the bottom of the lake. The lake then drained into the hole, expanding the size of that hole as the soil and salt were washed into the mine by the rushing water, filling the enormous caverns that had been left by the removal of salt over the years.
The resultant whirlpool sucked in the drilling platform, eleven barges, many trees and 65 acres (26 ha) of the surrounding terrain. So much water drained into those caverns that the flow of the Delcambre Canal that usually empties the lake into Vermilion Bay was reversed, making the canal a temporary inlet. This backflow created, for a few days, the tallest waterfall ever in the state of Louisiana, at 164 feet (50 m), as the lake refilled with salt water from the Delcambre Canal and Vermilion Bay. Air displaced by the water flowing into the mine caverns erupted through the mineshafts as compressed air and then later as 400-foot (120 m) geysers.
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Wikipedia