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About Dam Safety
Description
A Jurisdictional Dam is a dam creating a reservoir with a capacity of more than 100 acre-feet,
or creates a reservoir with a surface area in excess of 20 acres at the high-water line, or exceeds
10 feet in height measured vertically from the elevation of the lowest point of the natural surface
of the ground where that point occurs along the longitudinal centerline of the dam up to the crest
of the emergency spillway of the dam. For reservoirs created by excavation, or where the invert of
the outlet conduit is placed below the surface of the natural ground at its lowest point beneath the
dam, the jurisdictional height shall be measured from the invert of the outlet at the longitudinal
centerline of the embankment or from the bottom of the excavation at the longitudinal centerline of
the dam, whichever is greatest. Jurisdictional height is defined in Rule 4.2.19. The State Engineer
shall have final authority over determination of the jurisdictional height of the dam.
A Non-Jurisdictional Dam is a dam creating a reservoir with a capacity of 100 acre-feet or less
and a surface area of 20 acres or less and with a height measured as defined in Rules 4.2.5.1
and 4.2.19 of 10 feet or less. Non-jurisdictional size dams are regulated and subject to the
authority of the State Engineer consistent with sections 37- 87-102 and 37-87-105 C.R.S.