Crow Indian Tribe: Hydrology Resources Report
http://www.blm.gov/pgdata/etc/medialib/blm/mt/field_offices/miles_city/og_eis/crow.Par.48024.File.dat/hydrology.pdf

Bureau of Land Management: Montana State Office


This 12-page PDF is part of the final statewide oil and gas environmental impact statement and proposed amendment of the Powder River and Billings Resource Management Plans. This section thoroughly describes the hydrology of the Crow Reservation. Included are maps illustrating the hydrologic basin, groundwater, wells and springs, and both water and coalbed methane wells. Also included are detailed tables of the rivers, streams, and tributaries within the Crow Reservation.

This resource is referenced here:
Subject: Geoscience:Hydrology:Surface Water, Ground Water
Resource Type: Scientific Resources:Overview/Reference Work
Topics: Hydrosphere/Cryosphere:Surface Water, Groundwater