Lake Conditions
Illustrated map of Grand Lake St Marys

Lake levels

Clarence J Brown Reservoir, OH

water level
1010.96 ft
Condition
About average for this time of year
7-day change
-0.30 ft
30-day change
-1.13 ft
1-year change
-0.02 ft

Reading as of 2026-10-12 | the U.S. Geological Survey

Since yesterday
-0.09 ft
7-day change
-0.30 ft
30-day change
-1.13 ft
1-year change
-0.02 ft
Record high
1014.06 ft

In brief

Clarence J Brown Reservoir stood at 1,010.96 feet on Oct 12, 2026. That is higher than 56% of October readings since 2017.

Source: U.S. Geological Survey

Lake level timeline

1010.81011.21011.61012.01012.4SEP 12SEP 17SEP 22SEP 27OCT 02OCT 07OCT 12HIGH 1012.181010.96 ft

Records and averages

Current level1010.96 ft
Record high1014.06 ft (2026-05-28)
Record low1008.96 ft (2020-03-26)
Average of all readings1010.73 ft
Data span9 years (3,257 readings)

Level schematic

1,008.761,010.131,011.511,012.891,014.26PUBLISHED HIGH 1,014.06 ft1,010.96 ftPUBLISHED LOW 1,008.96 ft

Frequently asked questions

Is Clarence J Brown Reservoir full right now?

As of 2026-10-12, Clarence J Brown Reservoir sits at 1010.96 ft, which is about average for this time of year. Over the past 30 days the level has fallen 1.13 ft.

What is the water level at Clarence J Brown Reservoir today?

The most recent reading at Clarence J Brown Reservoir is 1010.96 ft (2026-10-12), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.

What is the highest Clarence J Brown Reservoir has ever been?

The highest level for Clarence J Brown Reservoir in our records is 1014.06 ft on 2026-05-28. The lowest is 1008.96 ft on 2020-03-26. Our record covers about 9 years of readings.

Is Clarence J Brown Reservoir low for this time of year?

Compared with every October in our records, the current level is higher than 56% of them, which we classify as about average for this time of year. Seasonal comparison matters more than the raw number, because most reservoirs draw down predictably through late summer and refill over winter and spring.

Why is Clarence J Brown Reservoir low right now?

Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Clarence J Brown Reservoir has fallen 1.13 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.

How much has Clarence J Brown Reservoir changed over the past year?

Clarence J Brown Reservoir is -0.02 ft compared with this date last year (1010.96 ft today). The full-history chart above covers 9 years, with a record high of 1014.06 ft and a record low of 1008.96 ft.

Download and cite

Quote this reading

Clarence J Brown Reservoir stood at 1,010.96 feet on Oct 12, 2026. That is higher than 56% of October readings since 2017.

From the U.S. Geological Survey, updated daily. The sentence changes with every new reading, so quote it with its date.

Download the full record

clarence-j-brown-reservoir-oh-water-level-history.csv

3,257 readings, Sep 30, 2017 to Oct 12, 2026. Daily readings. The longest gap since then is 17 days, from Jun 17, 2018. Columns: date, water_level_ft. 64 KB.

How to cite

MyWaterLevel, “Clarence J Brown Reservoir water level, 2017 to 2026,” data from U.S. Geological Survey, https://mywaterlevel.com/lake/oh/clarence-j-brown-reservoir/, accessed Oct 13, 2026.

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Source: the U.S. Geological Survey. All Ohio lake levels. Readings are provisional and may be revised. About our data and methods.