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Little Vermillion River
Little Vermillion River
Location
Country	United States of America
States	Illinois
Cities	Mendota, Troy Grove, La Salle
Physical characteristics
Source
• location	Mendota Township, LaSalle County, Illinois
• coordinates	41°36′46″N 89°05′44″W / 41.6128095°N 89.0956426°W
• elevation	912 ft (278 m)
Mouth
• location	Confluence with the Illinois River, LaSalle, Illinois
• coordinates	41°19′29″N 89°04′53″W / 41.3247568°N 89.0814716°W
• elevation	447 ft (136 m)
Length	34.7 mi (55.8 km)
Basin size	80,420 acres (32,540 ha)
Basin features
Progression	Little Vermilion River → Illinois River → Mississippi River → Gulf of Mexico
Landmarks	Mitchell's Grove Nature Preserve
Population	14600
Tributaries
• left	Tomahawk Creek
• right	Mendota Creek
GNIS ID	412427

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The Little Vermilion River is a 34.7-mile-long (55.8 km)^[2] tributary of the Illinois River, which it joins near LaSalle, Illinois, opposite the north-flowing Vermilion River.^[3] There is another "Little Vermilion River" in Illinois which is a tributary of the Wabash River.

Land Use

Approximately 75% of the land (60,580 acres (24,520 ha)) of the land in the watershed is devoted to agricultural activities, primarily corn (36,943 acres (14,950 ha)) and soybean (22,332 acres (9,037 ha)) production. Native wetlands account for 0.5% (434 acres (176 ha)) of land in the watershed.^[1]

Water Quality

An EPA report lists the southern section near La Salle, Illinois as impaired waterway due to excessive zinc from current and historic mining operations. It is also listed for elevated fecal coliform bacteria levels due to the use of combined sewage overflow systems in use by several municipalities within the watershed.^[1]