2024 Earthquake Bulletin
04/05/2024 16:00 update
Following consultation with the NJDEP Bureau of Dam Safety, as a precautionary measure, the NJWSA Dam Advisory condition will remain in effect until further notice.
NJWSA will continue to monitor the dams as we continue to experience aftershocks. No further updates will be provided unless there is a change in conditions at any of the dams. Notification about any change to the Dam Advisory condition will be issued.
04/05/2024 15:00 update
Conditions are unchanged from the previous update at noon.
04/05/2024 12:00
Following the occurrence of a magnitude 4.8 earthquake located 6km ESE of Califon, NJ, at 10:23am EST on April 5, 2024, the NJWSA declared a Dam Advisory Condition, as required by its Emergency Action Plans, for the dam at Spruce Run Reservoir and the three dams at Round Valley Reservoir. No such condition was issued for the dam at Manasquan Reservoir.
In the following hour, all downstream communities identified in the NJWSA’s Emergency Action Plans for each dam were notified and the four dams were inspected in person by a team of NJWSA engineers. NJWSA reviewed all dam instrumentation and found no anomalies. NJWSA also consulted with the NJDEP Bureau of Dam Safety and its consulting engineer for rehabilitation projects occurring at Spruce Run and Round Valley reservoirs, Schnabel Engineering, LLC.
As of 12:00pm EST, no dam safety concerns have been identified. A small sinkhole was identified near the Spruce Run dam, but it is not considered to be a dam safety issue at this time. The dams will continue to be monitored appropriately and further updates will be issued.