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St Marys River at Great Mills, MD

St Marys River MD USGS

St Marys River at Great Mills, MD (01661500) is a real-time streamflow monitoring station on the St Marys River in MD, operated by the U.S. Geological Survey. Riverbot tracks its streamflow and alerts anglers the moment flow and temperature hit their fishing window. 59 fish species are associated with this station in public fish records.

USGS site number
01661500
Agency
USGS
State
MD
Coordinates
38.2418, -76.5037

Live conditions & history

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Fish recorded near this station

Community observations nearby

St Marys River at Great Mills, MD has 59 fish species documented via iNaturalist research-grade observations within 10 km. These community-sourced records indicate fish presence in the vicinity.

Species include: Alewife (Alosa pseudoharengus), Yellow Bullhead (Ameiurus natalis), Brown Bullhead (Ameiurus nebulosus), American Eel (Anguilla rostrata), Fourspine Stickleback (Apeltes quadracus), and 54 others.

One species above is flagged non-native or potentially invasive (Northern Snakehead). Records show what has been observed near this station, not what is native to the watershed.

Where these records come from

Evidence
Community observations nearby
Research-grade community observations (iNaturalist) recorded near this station, not a formal survey.
Records
59 species
from 200 individual records
Observed
Mar 15, 2021 – Jul 12, 2026
200 dated records

Sources