Quite interestingly, it's also in the same place that Disneyland's expansion pad is located on Micechat's famous map from 2015; just beyond the Millenium Falcon ride warehouse.
These photos were taken three days ago at Disneyland from the parking structure. By my estimation, and using the trucks and workers seen in the shots, the pit at Disneyland is currently at least 30 feet deep. From MintCrocodile's excellent weekly blog...
http://mintcrocodile.blogspot.com/
Closer up on the pit... It's very deep. 30 feet? 50 feet?