Lake Surface Elevation
Reviewed • Standard Hydrology Definition • WaterLakeLevel
# Lake Surface Elevation
Lake surface elevation is the true physical height of the lake water surface above an official vertical datum, typically expressed in feet or meters above mean sea level (MSL).
Unlike local river stage readings, true surface elevations allow direct comparison between:
- Lake water level and boat ramp concrete elevations.
- Water surface and private dock pilings or seawall caps.
- High-water crests and FEMA flood insurance base flood elevations (BFEs).
The absolute vertical height of the lake surface measured against a standardized geodetic reference datum.
What Is Lake Surface Elevation?
Lake surface elevation is the true physical height of the lake water surface above an official vertical datum, typically expressed in feet or meters above mean sea level (MSL).
Why True Elevation Matters
Unlike local river stage readings, true surface elevations allow direct comparison between:
- Lake water level and boat ramp concrete elevations.
- Water surface and private dock pilings or seawall caps.
- High-water crests and FEMA flood insurance base flood elevations (BFEs).
Explore Other Hydrology & Boating Terms
Acre-Foot
A volumetric water unit representing the amount of water required to cover one acre of land to a depth of one foot.
Conservation Pool
The volume of water stored in a reservoir dedicated to beneficial uses such as drinking water, power, and recreation.
Datum
A reference surface or mathematical baseline from which vertical elevations or geographic coordinates are reckoned.
Dead Pool
The critical low-water elevation below which water cannot flow downstream through gravity outlets.
Drawdown
The deliberate or natural reduction of a lake or reservoir water surface elevation.
Evaporation Loss
The invisible volumetric loss of water from a lake surface into the atmosphere caused by heat, sun, and dry winds.