Deborah Bach has this announcement at Three sheets Northwest:
The Hiram M. Chittenden locks in Ballard will be closed during the day next Monday and Tuesday, Feb. 6 and 7.
The locks will be closed to all vessel traffic from 8 a.m. to 6 p.m. both days, but will remain open between 6 p.m. Feb. 6 and 8 a.m. the following morning, when they will close again until 6 p.m.
The closure is needed so erosion of the small lock wall can be repaired. Water has gradually eroded an area of the wall, causing a scour, or small ditch. The scour was detected by a sonar survey in 2009, and a subsequent dive inspection also revealed a void under the small lock foundation.