FLOOD01062

• Designation Number: 175
• County: Gilpin
• Community: Black Hawk
• Stream Name: North Clear Creek, Gregory Gulch, Chase Gulch
• Title: Floodplain Information Report - North Clear Creek, Gregory Gulch, Chase Gulch, Black Hawk, Colorado
• Date: 6/1/1980
• Designation Date: 5/1/1981
• Floodplain - Doc Type: Floodplain Report/Masterplan

and Discharge Data table, Table 4, lists these elevations at selected

reference points. The Flooded Area plates 3 through 11 give the plan

view of the flooded area on a contour base map and the Iligh water elevations

for the lOO-year flood can be interpolated from this. The Flood Profile

.

plates, Plates 12 through 21 show the streambed elevation and the high water

elevations for all four frequency floods on North Clear Creek and the stream-

bed elevation and lOO-year high water elevations on Gregory Gulch and Chase

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Gulch. Also, the Cross Section plate, Plate 22 shows a graphical representa-

tian of the high water elevations at typical valley cross sections throughout

the study reach.

The Flood Profiles may be used in areas where contradiction arises over

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the 100-year flood boundary on the Flooded Are. plates. Since the Flood

Profile plates give the elevations and distance or stationing from a known

point, the high wat~r elevations can be surveyed on the ground to establish

the precise elevation and limits of flooding at any location.

The following

vertical control marker data can be used for this purpose.

Fi e ld
Stamping
Identification

Plate
No.

Elevation
above MSL

5

USC&GS disk .3 miles W along ~ from ~
jtc. at Gregory Gulch in Blae~~awk; 19
SE of centerline, 71 SW of prominent verti-
cal ridge in the top of the SW face of large
sloping rock 2' higher than road.

USC&G~isk ~t Central City on road leading
from ~~ to 61~; in the SE curb of concrete
bridge over ~eka Creek near the Black Hawk-
Central City boundary.

USGS dis~t Black Hawk; 34' E 2~the center-
line of 119 and Gregory Gulch [~J jet. on
a small edge 3.5' higher than road.

USGS chis led square on NW end on ~erete
box culvert over Silver Creek on ~~~
Silver Creek is the first draw entering from
the N and just downstream of the Black Hawk
treatment plant.

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C-164-1938 Reset 8100.522

7

B-164-1934 8241.749

8

D-1-1940 8055.871

11

none 7930.76

25

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