Search by waterbody

Implementation can be straightforward (something similar to how each station code is associated with a saltwater flag). Challenge will be in curating a naming system for any location on all waterbodies in the state.

Start by tracing how station codes are associated with the saltwater flag. Then determine how waterbody names should be curated for locations throughout the state and how those names should support search. Done means the naming system and waterbody search behavior are defined and implemented consistently.

Written by the indexing model from the issue text.