Sweet Briar Dam-Mid Reservoir Water Temperature
Sweet Briar Dam-Mid Reservoir in Morton County, North Dakota averages about 64°F at the surface in summer — warmest in Jun (~74°F) and coldest in Oct (~44°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 25 field readings (2022–2023) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Sweet Briar Dam-Mid Reservoir warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Sweet Briar Dam-Mid Reservoir scored F on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby North Dakota lakes
Summer average ~79°F
Summer average ~64°F
Summer average ~63°F
Summer average ~66°F
Summer average ~67°F
Summer average ~71°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Sweet Briar Dam-Mid Reservoir?
Sweet Briar Dam-Mid Reservoir has a typical summer surface temperature of about 64°F. It is usually warmest in June (around 74°F) and coldest in October (around 44°F). These are typical values by month from 25 EPA Water Quality Portal field readings (2022–2023), not a live reading.
When is Sweet Briar Dam-Mid Reservoir warmest?
Surface water at Sweet Briar Dam-Mid Reservoir is typically warmest in June, reaching about 74°F. Lake surface temperature lags air temperature by several weeks, so the warmest water usually arrives in mid-to-late summer even though the hottest air can come earlier.
Is Sweet Briar Dam-Mid Reservoir warm enough to swim?
At its typical summer peak of about 64°F, Sweet Briar Dam-Mid Reservoir rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Sweet Briar Dam-Mid Reservoir water temperature data come from?
Every temperature on this page is a typical (climatological) value computed from real surface-water field readings collected by state and federal agencies and published through the EPA Water Quality Portal — 25 readings from 1 monitoring station between 2022 and 2023. They describe what is typical for each month, not the temperature right now.
About this data
Water temperatures are a climatology — the typical value for each month, averaged from real surface-water field readings collected by state and federal agencies and published through the EPA Water Quality Portal. They tell you what to expect, not the temperature at this moment. Actual conditions vary with recent weather, depth, and time of day.