Hydrograph of Sandusky River at Fremont Ohio

Hydrograph of the Sandusky River at Fremont Ohio (USGS gauge 04198000; waterwatch.usgs.gov) 15 May-15 September 2017. The upper dashed line indicates the 90^th percentile flow. The lower dashed line represents the minimum flow for grass carp eggs to remain suspended in the water column while drifting. Green circles indicate dates on which fertilized eggs were collected. Red circles indicate sampling was conducted but no eggs were collected. This graph was used in an update to the Great Lakes Panel on Aquatic Nuisance Species in May 2018.