The Jones Tract is an island containing Lower Jones Tract and the Upper Jones Tract in the Sacramento-San Joaquin River Delta in San Joaquin County, California, fifteen kilometres west of Stockton. The 4,900 ha (12,000 acres) island is bounded on the north by Empire Cut, on the northeast by Whiskey Slough, on the southeast by Trapper Slough, and on the west, Middle River. The tracts are bifurcated by the parallel running Mokelumne Aqueduct, the Achison Topeka and Santa Fe Railroad, and West Lower Jones Road.
2004 levee failure
On 3 June 2004, the Upper Jones Tract levee near Woodward Island failed, inundating the entire island with more than 150,000 acre·ft (190,000,000 m3) of water. The island, which lies 3 metres below sea level, required three weeks to repair the breach, and an additional five months for de-watering after the pumps were shut down on 18 December 2004.
- Michael Mierzwa and Bob Suits (October 2005). "Chapter 3: Jones Tract 2004 Levee Break DSM2 Simulation". Methodology for Flow and Salinity Estimates in the Sacramento-San Joaquin Delta and Suisun Marsh 26th Annual Progress Report (California Department of Water Resources): page 3-2.
- U.S. Geological Survey Geographic Names Information System: Upper Jones Tract
- U.S. Geological Survey Geographic Names Information System: Lower Jones Tract
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