Mosquito Springs Run is a third-magnitude spring with a series of vents in the main pool and run (labeled 1, 2, 3, 4, and 5). The spring head is at the bottom of a steep ravine and has two main vents (1 and 2) in a pool about 20 feet long by 10 feet wide. Vent 1 is in the south part of the pool, and vent 2 is in the north part. Green algae and white sulfur-reducing bacteria are present in the pool. About 140 feet down the run, a tree across the run can be used as a bridge to walk to the other side of the run to sand boil 3, situated in a small run on the right (south) side of the main spring run. Sand boil 4 is in the main spring run about 20 feet toward the northeast of sand boil 3. The ravine becomes less steep downstream as the run flows into a broad wetlands area. Sand boil 5 is in a seepage area to the south-southeast of vent 3 (a camping area is on the upland area to the east of vent 5).