River Conditions
Illustrated map of Grand Lake St Marys

River stage

Troy, Great Miami River

River level
2.66 ft
Status
Below flood stage
7-day change
-0.26 ft
Recent high
9.73 ft
Recent low
2.35 ft

Last reported 2026-10-13 | NWS TRYO1

30-day change
-0.23 ft
Average
3.48 ft
Readings
122
Data span
122 days
Record crest
16.58 ft

In brief

The Great Miami River at Troy, OH read 2.66 ft on Oct 13, 2026, 6.84 ft below action stage. That is 0.23 ft lower than 30 days earlier.

Source: National Weather Service gauge TRYO1

Water 68 °F (20 °C) · +3 °F in 24 hours

River level timeline

1.73.96.18.310.5SEP 13SEP 18SEP 23SEP 28OCT 03OCT 08OCT 13ACTION 9.50 ftHIGH 7.63LOW 2.672.67 ftLAST READING

Stage threshold profile

Action stage 9.50 ftMinor flooding 12.00 ftModerate flooding 13.00 ftMajor flooding 17.00 ft CURRENT 2.66 ft

Highest crests on record

RankCrestDate
1 16.58 ft 2013-12-22
2 16.40 ft 1958-06-11
3 16.20 ft 1959-01-22
4 16.08 ft 2003-07-09
5 16.02 ft 1995-08-08
6 15.66 ft 2005-01-06
7 15.49 ft 1990-12-30
8 15.05 ft 2011-03-06

Flood crests recorded at this gauge by the National Weather Service.

What happens at each level

  1. 12.00 ft

    Tipp-Elizabeth Road floods between Tipp City and Ohio 202, with water also covering Route 202 south of Route 41. Water approaches County Road 25A outside of Troy and near Tipp City. East State Route 571 is also flooded. The Levee protected area of Troy is protected to a stage of approximately 17.5'.

  2. 13.00 ft

    Flooding occurs along County Road 25A south of Troy and Tipp-Elizabeth Road near Tipp City. Property along the 600 block of North County Road 25A near the Fairgrounds begins to flood, with East State Route 571 also flooded. Portions of Farver Road and Covered Bridge park north of Troy are flooded, as well as Eldean Road. Within the levee protected areas of of Troy...structures are protected to a stage of approximately 17.5 feet.

  3. 14.00 ft

    Flooding of some homes and businesses occurs north of Troy near the county fairgrounds on 25A or North Elm Street, with extensive flooding ongoing elsewhere along Route 25A and Eldean Road. Some farm houses along Route 202 are cut off. Extensive flooding of Miami Shores Golf Course Within the levee protected areas of Troy, protection exists to a stage of about 17.5 feet.

  4. 15.00 ft

    Some homes and businesses are flooded by as much as 1 foot of water along route 25A near the County Fairgrounds north of Troy, with the Fairgounds also flooded. Extensive flooding also occurs elsewhere on Route 25A, Lytle Road, East State Route 41, Tipp Elizabeth Road and Route 202, leaving several homes cut off. Within the levee protected areas of of Troy...structures are protected to a stage of about 17.5 feet.

  5. 16.00 ft

    Numerous homes and businesses are flooded with several feet of water along route 25A near the County Fairgrounds north of Troy, with flooding along East State Route 41 and Route 202. Within the levee protected areas of Troy...property is protected to a stage of roughly 17.5 feet.

  6. 17.00 ft

    While the levee protected areas of Troy are protected to approximately 17.5 feet, significant flooding of homes and businesses both south and north of Troy along Route 25A occurs from Eldean to near the Fairgrounds, and also along 25A south of South Market Street. On the east bank of the river, extensive flooding between route 202 and the river occurs.

  7. 18.00 ft

    The Troy levee is overtopped from near Main Street to along South Market Street within Troy itself. Significant flooding of homes and businesses both south and north of Troy along Route 25A worsens, with many structures flooded, from near Eldean to near the county fairgrounds, and then along 25A south of South Market Street. On the east bank of the river, extensive flooding between route 202 and the river occurs.

  8. 19.00 ft

    Widespread flooding behind the levee occurs, with hundreds of homes and businesses affected. Flooding also occurs east of the river east of Stonyridge Avenue. Widespread flooding of homes and businesses with water several feet deep occurs.

Written by the local National Weather Service forecast office for this exact gauge.

Frequently asked questions

Is the Great Miami River flooding at Troy?

No. The Great Miami River at Troy is at 2.66 ft, 6.84 ft below action stage.

What is the flood stage at Troy?

The National Weather Service sets action stage 9.5 ft, minor flooding 12 ft, moderate flooding 13 ft and major flooding 17 ft.

What is the highest the Great Miami River has been at Troy?

The highest crest on record is 16.58 ft, on 2013-12-22.

Is the Great Miami River high or low right now at Troy?

At 2.66 ft it is higher than 25% of readings over the last 122 days.

How warm is the water at Troy, Great Miami River?

The water temperature at Troy, Great Miami River is 68 °F (19.7 °C), measured 7:00 pm by USGS. It has risen 2.9 °F in the last 24 hours.

Stage and flood information from the NOAA National Weather Service (gauge TRYO1); daily history from the U.S. Geological Survey (site 03262700). Last reading 2026-10-13. For flood safety decisions always follow official National Weather Service warnings.