Warning! These charts have not been reviewed for accuracy.
River Stage Definitions
MONITOR - FLOOD - DANGER STAGES
CROSS SECTION - TYPICAL NON-LEVEED STREAM
MONITOR STAGE - The Stage at which initial action must be taken by
concerned interests (livestock warning, removal of equipment from lowest
overflow areas, or simply general surveillance of the situation). This level
may produce overbank flows sufficient to cause minor flooding of low-lying
lands and local roads.
FLOOD STAGE - The Stage at which overbank flows are of sufficient
magnitude to cause considerable inundation of land and roads and/or threat
of significant hazard to life and property.
CROSS SECTION-TYPICAL LEVEED STREAM
MONITOR STAGE - The Stage at which patrol of flood control project
levees by the responsible levee maintaining agency becomes mandatory, or the Stage at which flow occurs into bypass areas
from project overflow weirs.
PROJECT FLOOD STAGE - The Stage at which the flow in a flood control
project is at maximum design capacity (U.S. Corps of Engineers "Project
Flood Plane"). At this level there is a minimum freeboard of 3 feet to the
top of levees.
DANGER STAGE - The Stage at which the flow in a flood control project
is greater than maximum design capacity and where there is extreme danger
with threat of significant hazard to life and property in the event of levee
failure. This is generally 1 foot above project flood stage.