Get depth data from Oliver et al. 2015
References
Oliver SK, Soranno PA, Fergus EC, Wagner T, Webster KE, Scott C, Winslow LA, Downing JA, Stanley EH. 2015. LAGOS - Predicted and observed maximum depth values for lakes in a 17-state region of the U.S. Long Term Ecological Research Network. doi:10.6073/pasta/f00a245fd9461529b8cd9d992d7e3a2f