Plum River

locationJo Daviess County southeast of Stockton, Illinois

coordinates42°20′31″N 89°59′39″W / 42.3419444°N 89.9941667°W / 42.3419444; -89.9941667 (Plum River origin)

elevation988 ft (301 m)

location

Confluence with the Mississippi at Savanna, Illinois

Plum River
Physical characteristics
Source
• location	Jo Daviess County southeast of Stockton, Illinois
• coordinates	42°20′31″N 89°59′39″W / 42.3419444°N 89.9941667°W / 42.3419444; -89.9941667 (Plum River origin)
• elevation	988 ft (301 m)
Mouth
• location	Confluence with the Mississippi at Savanna, Illinois
• coordinates	42°05′14″N 90°09′15″W / 42.0872222°N 90.1541667°W / 42.0872222; -90.1541667 (Plum River mouth)
• elevation	584 ft (178 m)
Length	47 mi (76 km)
Basin features
Progression	Plum River → Mississippi → Gulf of Mexico
GNIS ID	415959

The Plum River is a tributary of the Mississippi River, about 46.6 miles (75.0 km) long,^[1] in northwestern Illinois in the United States.^[2] It rises in Jo Daviess County and flows generally south-southwestwardly into Carroll County, where it joins the Mississippi at Savanna. Among its several short tributaries are:

• The East Plum River, which rises in Stephenson County and flows southwestwardly into Carroll County, joining the Plum at 42°10′16″N 90°01′20″W / 42.1711111°N 90.0222222°W / 42.1711111; -90.0222222 (East Plum River mouth)^[3]
• The Muddy Plum River, which flows for its entire length in Jo Daviess County. It joins the Plum River at 42°13′35″N 90°01′45″W / 42.2263889°N 90.0291667°W / 42.2263889; -90.0291667 (Muddy Plum River mouth)^[4]
• The Middle Fork Plum River joins the Plum River at 42°16′29″N 90°02′12″W / 42.2747222°N 90.0366667°W / 42.2747222; -90.0366667 (Middle Fork Plum River mouth)^[5]
• The North Fork Plum River has its confluence with the Plum River at 42°15′46″N 90°02′33″W / 42.2627778°N 90.0425°W / 42.2627778; -90.0425 (North Fork Plum River mouth)^[6]