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<br />Fortifioation Creek Report
<br />nevieed 21 March 1949
<br />
<br />alluvial plain, upon whioh the town of Craig is looated, downstream from stream
<br />
<br />mile 2.6. In general, floods QCcur in the epring ae a result of thaWB and snow
<br />
<br />melt. Freezing and thawing during the winter cause a heavy deposit of ice to
<br />
<br />form in the low-flow channel cf Fortification Creek. In the epring thie ioe
<br />
<br />breaks up into large cakes and move. downstream. Channel obstructions, B~h
<br />
<br />as sharp bends or bridges, cause these oakes of ice to form jams that raise
<br />
<br />the water level in the channel. Under normal conditione of flow, when the
<br />
<br />ohannel is free of ioe, the minimum damaging discharge would be about 700 cubio
<br />
<br />feet per second. However, even smaller flows when associated with ioe jams
<br />
<br />CaUBe the water to overflow the banks. Local residents have stated that ice
<br />
<br />Jams ocourring at a time of rapid snow melt are one of the principal cause~
<br />
<br />of floods on Fortifioation Creek. Erosion along the channel is minor. High
<br />
<br />water in Yamps. River has never reached the lower edge of the town of Craig.
<br />
<br />Recent channel reotifioation of the river near the mouth of Fortification
<br />
<br />Creek bae improved the disoharge oonditicne affecting the oreek.
<br />
<br />
<br />49. Streets in Craig, in general, slope away from Fortification Creek.
<br />
<br />Consequently, when the creek overflows, the water runs into the town and
<br />
<br />inundates a large area of the resident~al and business districts. Although
<br />
<br />the velooity of flow 1s relatively low, ~ee from overflow to residenoes
<br />
<br />and business establishmente are high because moet places have baeements in
<br />
<br />Which items subject to excessive damage by inundation of water are stored.
<br />
<br />Overflowe by Fortification Creek aleo re.ult in large damage. to indu.trial
<br />
<br />establishments and to h~ghw~ end railroad facilities. A great flood, euch ae
<br />
<br />
<br />the ete.ndard projeot flOOd. would eeriously d1erupt community Ufe through
<br />
<br />destruction of, or .serious damage to, transportation and communioation
<br />
<br />facilities. Life would be endangered: through drowning: or, se a result
<br />
<br />of epidemics oaused by co~taminatlon of water supply; or, by creation of
<br />
<br />general unsanitary conditions.
<br />
<br />50. Related problems.__The demand for water in the Fortification Creek
<br />
<br />y
<br />
<br />Baein ba. increaeed with the growth in population ~d with the reclamation
<br />of more lend on the meeae and on the gently eloping hille. The town of
<br />
<br />Craig, which obtains water for domestic use by pumping fram Yampa River,
<br />
<br />Ib
<br />
<br />20
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