Number of stations for each river area by year: (A) Pocomoke and Tangier Sounds, (B) Great Wicomico River, (C) Rappahannock River, (D) Piankatank River, (E) Mobjack Bay, (F) York River, (G) James River, and (H) Elizabeth and Lafayette Rivers.
Number of stations for each river area by year: (A) Pocomoke and Tangier Sounds, (B) Great Wicomico River, (C) Rappahannock River, (D) Piankatank River, (E) Mobjack Bay, (F) York River, (G) James River, and (H) Elizabeth and Lafayette Rivers.