Major floods in recent history and their recorded high water elevations are listed in the following table:

1986

The 1986 storm caused the highest recorded flood elevations in the Point Pleasant area. It occurred over a 10-day period from February 11 through 20. Rainfall exceeded the 100-year frequency over many portions of the drainage area. Peak flows in the Cosumnes and Mokelumne rivers averaged between 60-to 110 year frequency, and Morrison Creek averaged 50- to 60-year frequency.

• Return Period for Total Storm Depth 1986 shows the rainfall-frequency distribution of the 1986 storm over the watersheds impacting Point Pleasant.
• 1986 Historical Flooding shows the flooded area in BSL for this storm.
• 1986 Observed Stages shows runoff hydrographs for three locations and the rainfall pattern from a local rain gauge

1997

The 1997 storm was the largest recorded event on the Cosumnes River, with peak flow at the Michigan Bar stream gauge estimated to be close to a 200-year event. Many Cosumnes levees breached during this storm.

• 1997 Historical Flooding shows the resulting inundation area in BSL.
• 1997 Observed Stages shows runoff hydrographs for four locations and the rainfall pattern from a local rain gauge
  

Return to: Beach Stone Lakes/Point Pleasant Flood Plan