HomeWater ReportBig Slough Water Report – North Port Blvd. Big Slough Water Report – North Port Blvd. adminSeptember 30, 2022September 30, 2022 The current Gage Height of the Big Slough at North Port Blvd. is 24.54 Ft. Compare this to a gage height of 20 ft on Wednesday September 28th, 2022.