JASPER — Heavy rain expected through the weekend could push Sam Rayburn Reservoir to record heights and send floodwater rushing over the emergency spillway.

Texas’ largest lake was at 175.08 feet Thursday morning before another round of late spring thunderstorms moved into the region. Record elevation is 175.15 feet set in March 1992 and water flows over the emergency spillway at 176 feet. Lake levels are measured in height above sea level rather than actual depth. Normal elevation at Sam Rayburn is 164.40 feet.

Josh Edwards’ email address is josh.edwards@dailysentinel.com.