Editing Hudson River (section)

===Upper Hudson River===
Using river names as seen on maps, Indian Pass Brook flows into [[Henderson Lake (New York)|Henderson Lake]].  The outlet of Henderson Lake is most commonly referred to as the official start of the Hudson River, as it flows east and meets the southwest flowing Calamity Brook. The [[confluence]] of the two rivers however is where most maps begin to use the Hudson River name on a cartographical basis. South of the outlet of Sanford Lake, the Opalescent River flows into the Hudson.<ref name=usgs/>

The Hudson then flows south, taking in Beaver Brook and the outlet of Lake Harris. After its confluence with the Indian River, the Hudson forms the boundary between Essex and Hamilton counties. The Hudson flows entirely into Warren County in the hamlet of [[North River, New York|North River]], and takes in the [[Schroon River]] at [[Warrensburg, New York|Warrensburg]]. Further south, the river forms the boundary between Warren and Saratoga Counties. The river then takes in the [[Sacandaga River]] from the [[Great Sacandaga Lake]].<ref name="Hudson River Map"/>

Shortly thereafter, the river leaves the Adirondack Park, flows under [[Interstate 87 (New York)|Interstate 87]], and through [[Glens Falls]], just south of [[Lake George (lake), New York|Lake George]] although receiving no streamflow from the lake. It next goes through [[Hudson Falls]]. At this point the river forms the boundary between Washington and Saratoga Counties.<ref name="Hudson River Map"/> Here the river has an elevation of {{convert|200|ft|m}}.<ref name="USGS Water Quality Assessment"/> Just south in [[Fort Edward (town), New York|Fort Edward]], the river reaches its confluence with the [[Champlain Canal]],<ref name="Hudson River Map"/> which historically provided boat traffic between New York City and [[Montreal]] and the rest of [[Eastern Canada]] via the Hudson, [[Lake Champlain]] and the [[Saint Lawrence Seaway]].<ref name="Champlain Canal"/>

Further south the Hudson takes in water from the [[Batten Kill River]] and Fish Creek near [[Schuylerville]]. The river then forms the boundary between Saratoga and Rensselaer counties. The river then enters the heart of the [[Capital District, New York|Capital District]]. It takes in water from the [[Hoosic River]], which extends into [[Massachusetts]]. Shortly thereafter the river has its confluence with the [[Mohawk River]], the largest tributary of the Hudson River, in [[Waterford, New York|Waterford]].<ref name="USGS Water Quality Assessment"/><ref name="Hudson River Map"/> The river then reaches the [[Federal Dam (Troy)|Federal Dam]] in [[Troy, New York|Troy]], marking an impoundment of the river.<ref name="Hudson River Map"/> At an elevation of {{convert|2|ft|m}}, the bottom of the dam marks the [[head of tide|beginning of the tidal]] influence in the Hudson as well as the beginning of the lower Hudson River.<ref name="USGS Water Quality Assessment"/>