Portage River (Jackson County, Michigan)
# Portage River (Jackson County, Michigan)

The Portage River is a 15.5-mile-long (24.9 km) river in the U.S. state of Michigan, flowing mostly southwesterly through northeast Jackson County.

The Portage River rises at approximately 42°22′26″N 84°10′48″W﻿ / ﻿42.37389°N 84.18000°W﻿ / 42.37389; -84.18000 in the Portage Lake Swamp in the Waterloo State Recreation Area. The river flows mostly southwest into the Grand River at 42°18′54″N 84°23′42″W﻿ / ﻿42.31500°N 84.39500°W﻿ / 42.31500; -84.39500 in Blackman Charter Township just north of the city of Jackson. The Portage River forms the boundary between the townships of Henrietta and Leoni.

## Drainage basin

The Portage River drains all or portions of the following administrative divisions:

* Ingham County
   * Bunker Hill Township
   * Ingham Township
   * Stockbridge Township
* Jackson County
   * Blackman Charter Township
   * Grass Lake Township
   * Henrietta Township
   * Leoni Township
   * Waterloo Township
* Washtenaw County
   * Lyndon Township
   * Sylvan Township

## Named tributaries

From the mouth:

* (right) Wildcat Creek
   * Brill Lake
* (right) outflow from
   * St. John Lake
   * Eagle Lake
   * Mud Lake
* (left) Batteese Creek
   * Batteese Lake
   * Hewes Lake
* (left) Orchard Creek
   * (left) Cahaogan Creek
   * (right) Thornapple Creek
      * (left) Pickett Drain
         * Standish Lake
      * (right) Jacobs Lake Drain
         * Jacobs Lake
* (right) outflow from Portage Lake
* Little Portage Lake
   * (right) outflow from series of lakes and small streams including
      * Locker Lake
      * Riley Lake
      * Notten Lake
      * Lehman Lake
   * (left) Honey Creek
   * Portage Lake Swamp
