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Caernarvon and Davis Pond Diversions
2025 Operations Plans:
Caernarvon Operations Status Update:
Black Bay nr Snake Island (USGS site 07374526)
Caernarvon 15ppt Gage: Black Bay nr Stone Island (USGS site 07374526)
Caernarvon 5ppt Gage: Crooked Bayou (USGS site 073745257)
2025 Caernarvon Freshwater Diversion discharge and 14-day salinity moving average at the USGS Snake Island nr Pointe-A-La-Hache, LA gage (07374526) through 06/29/2025. These data are provisional. The 2025 Caernarvon Freshwater Diversion Operations Plan (Operations Plan) has been modified for 2025 to base operations on a salinity range for the eastern oyster, rather than on the 10-year monthly mean salinity for the primary gage in use. Additional changes to operations, including the use of the Snake Island gage year-round and the implementation of a 7 ppt salinity buffer, are explained in the Operations Plan, which can be accessed through the Caernarvon Operations Plan link above. Due to a loss of data at the Snake Island gage between 03/28/2025 and 04/09/2025, the salinity moving average between 04/10/2025 and 04/22/2025 is calculated on less than the standard 14 days of data. Salinity data are not available between 05/25/2025 and 06/29/2025 due to equipment malfunction.
Davis Pond Operations Status Update:
Davis Pond 15ppt Gage: Barataria Bay nr Grand Terre (USGS site 291929089562600)
Davis Pond 5ppt Gage: Little Lake Bay Dos Gris (USGS site 292800090060000)
2025 Davis Pond Freshwater Diversion discharge and 14-day salinity moving average at the USGS Little Lake near Bay Dosgris E of Galliano, LA gage (292800090060000) through 06/29/2025. These data are provisional. The Little Lake gage is the primary gage used to guide diversion operations from June through November. These months are shaded on the graph.
Caernarvon Overview Information
The project was authorized on October 27, 1965, by Public Law 89-298, of the 89th Congress, 1st Session. It is near Braithwaite, Louisiana, on the left descending bank of the Mississippi River in Plaquemines Parish at mile 81.5.
Davis Pond Overview Information
The project was authorized by the Flood Control Act of 1965, the Water Resources Development Act of 1974, and the Water Resources Development Act of 1986. It is near Luling, Louisiana, on the west bank of the Mississippi River in St. Charles Parish at mile 118.4.