| Mill Creek | |
| Pushpin Map: | USA Illinois |
| Pushpin Map Size: | 250 |
| Pushpin Map Caption: | Mill Creek |
| Pushpin Map Alt: | pushpin map showing location of Mill Creek |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Illinois |
| Subdivision Type3: | County |
| Subdivision Name3: | Lake |
| Length: | 15miles |
| Depth Avg: | 6.51 ft (1.98 m) |
Mill Creek is a tributary of the Des Plaines River, roughly 15miles long and located entirely within Lake County, Illinois. Mill Creek begins in the village of Grayslake and flows into the Des Plaines River at the 26.5 river mile within the village of Gurnee.[1] Upkeep is done by the Lake County Forest Preserve District.
In 1838 a man known by the name of Jacob Miller built a sawmill along the tributary somewhere near the village of Old Mill Creek in addition to the first flouring mill of Lake County.[2] However, this year is debated and historians believe it could have been built as early as 1834 and as late as 1840. This date is historically important as this could mean that the name either predates or came after the formation of Lake County by the Illinois State Legislature in 1839.[3] The exact location of the sawmill is also lost to history, though it is said that it was located "not far from the town line now separating Warren from Newport."[4] Likely near where modern day West Millburn Road and Ancona Avenue would have met.
Mill Creek has been labeled on maps of the state and county as early as 1861.[5]
In 1941 an unnamed farmer built a small timber dam on Mill Creek in what is now the census-designated place of Grandwood Park.[6] [7] This consequently formed Grandwood Lake that same year. The dam was partially destroyed due to heavy rains in northern Illinois in 2017 and was replaced with one made of concrete in 2019.[8]
The Des Plaines River Trail crosses the confluence of the two rivers just south of the Sedge Meadow Forest Preserve.[9]