BOARD00021

• Board Meeting Date: 7/12/1965
• Description: Minutes
• Board Meetings - Doc Type: Meeting

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understand, is to be completed by the 23rd of
July.

Getting back to your basic question as
to whether or not we would recommend designs
of adequate capacity in the reconstruction of
these bridges, the Bureau of Public Roads will, I
of course, check with us; they will check with
the United states Geological Survey; and all
other water resources agencies, as to the re-
quired capacity. In the restoration of the
permanent bridges, I am quite certain that
they will enlarge the hydraulic capacity, as
"re call it.

I would like to comment now, just briefly,
on Bijou Creek and the Corps' planning with
respect to Bijou Creek. Hr. Sparks has men-
tioned three alternatives for Bijou Cree],. We
believe that protection of the Bijou Valley is
essential. In this respect we believe that we
should have some major flood control reservoirs
on the tributaries to Bijou Creek, possibly
above Hoyt. Vie will study the Hoyt site. This
is a 7~-mile dam embankment. However, the Hoyt
site is probably the most valuable location in
the Bijou Valley, so we are reluctant to put a
dam in the Hoyt site. But, as Hr. Sparks men-
tioned earlier, the last extreme flood that
occurred was in 1935, with an estimated l35,OOO
cubic feet per second which went into the South
Platte at the mouth of the Bijou.

I had Ol:r hydraulic engineers check out
as quickly as they could some aerial photographs
of the flood outline of the Bijou flood. We
have a minimum estimate on the basis of this,
and on the basis of what we call 'conveyance
curves', that the third flood in June, 1965,
had a pe~, discharge of at least 280,000 cubic I
feet per second. I think we'll find, when we
actually go in and make cross-section surveys,
that this thing will approach 350,000 to 400,000
cubic feet a second. A flood of that magnitude,
I believe, has to be partially controlled up
in the headwaters."