St. Marys River
River in Michigan, read from its USGS gauge, draining about 80,900 square miles. Figures refresh every fifteen minutes.
Discharge
78,500
cfs · 19 min ago
Normal for today
92,100
cfs median, 17 yrs
Water temp
—
not measured here
Gage height
579.69
ft
Reading the number
On this date the gauge has averaged 92,100 cfs over 17 years of record, with the middle half of years falling between 62,900 and 95,300 cfs. Today sits inside that band, which is as close to a normal October day as the gauge can tell you.
Regional hatch calendar
What is likely hatching near St. Marys River
St. Marys River does not have its own verified chart yet. This calendar is combined from the verified charts on North Branch Au Sable River (123 mi), Au Sable River (127 mi), South Branch Au Sable River (130 mi). Treat it as regional timing, and file a report if you see something different here.
| Insect | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Blue-Winged Olive | January: absent | February: absent | March: absent | April: peak | May: active | June: active | July: active | August: active | September: active | October: peak | November: active | December: absent |
| Brown Drake | January: absent | February: absent | March: absent | April: absent | May: active | June: peak | July: absent | August: absent | September: absent | October: absent | November: absent | December: absent |
| Hendrickson | January: absent | February: absent | March: absent | April: peak | May: peak | June: absent | July: absent | August: absent | September: absent | October: absent | November: absent | December: absent |
| Hex | January: absent | February: absent | March: absent | April: absent | May: absent | June: peak | July: peak | August: absent | September: absent | October: absent | November: absent | December: absent |
| Isonychia | January: absent | February: absent | March: absent | April: absent | May: absent | June: peak | July: peak | August: active | September: active | October: absent | November: absent | December: absent |
| Sulphur | January: absent | February: absent | March: absent | April: absent | May: peak | June: peak | July: active | August: absent | September: absent | October: absent | November: absent | December: absent |
| Trico | January: absent | February: absent | March: absent | April: absent | May: absent | June: active | July: peak | August: peak | September: active | October: absent | November: absent | December: absent |
| Caddis | January: absent | February: absent | March: absent | April: active | May: peak | June: peak | July: active | August: active | September: absent | October: absent | November: absent | December: absent |
| Terrestrials | January: absent | February: absent | March: absent | April: absent | May: absent | June: absent | July: active | August: peak | September: peak | October: absent | November: absent | December: absent |
| Golden Stonefly | January: absent | February: absent | March: absent | April: absent | May: absent | June: peak | July: active | August: absent | September: absent | October: absent | November: absent | December: absent |
| Little Black Stonefly | January: absent | February: absent | March: absent | April: peak | May: active | June: absent | July: absent | August: absent | September: absent | October: absent | November: absent | December: absent |
| March Brown | January: absent | February: absent | March: absent | April: absent | May: active | June: active | July: absent | August: absent | September: absent | October: absent | November: absent | December: absent |
Reports
From anglers on St. Marys River
No reports filed here yet. The first one becomes the page’s local knowledge, stamped with the flow at the time. File a report.