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<br /> Table 4
<br /> FLOOD PLAIN REFEr:ENCE DATA
<br />Reference Distance Approx. m '"
<br />Point in Streambed Elev. Elev.
<br />Number feet Elev. M'L M5L Remarks
<br />1 117,820 9446 9455.5 9456.0 Cemetery Road
<br />2 118,330 9450 9456.2 9457.0
<br />3 118,620 9454 9456.8 9457.5 Cross Section 1-1
<br />4 119,220 9465 9467.2 9468.0
<br />5 119,670 9475 9479.3 9480.7
<br />6 119,960 9478 9481.7 9483.7
<br />7 120,440 9488 9490.3 9491.6
<br />8 120,910 9495 9498.4 9499.6
<br />9 121,280 9501 9504.9 9505.6
<br />10 121.660 9507 9510.5 9511.3
<br />11 122,020 9512 9515.6 9516.3
<br />12 122,430 '1522 9528.0 9528.6 Cross Section 2-2
<br />13 122,720 9531 9534.5 '1535.1
<br />14 122,%0 9538 9541.9 9542.1
<br />15 123,040 9541 9553.9 9554.7 Watson Road
<br />H 123,140 9545 9554.1 9555.0
<br />17 123,550 9552 9555.0 9556.1
<br />18 123,820 9558 9561.7 9562.4
<br />19 123,910 9560 9572.0 9572.5 Lincoln Avenue
<br />20 124,020 9564 9572.1 9573.0
<br />2l 124,520 9575 9580.3 9581.2 Cross Section 3-3
<br />n 124,870 9582 9586.0 9586.7
<br />1l 125,110 9583 9588.1 9589.2
<br />24 125,440 9583 9S81l.7 9589.9
<br />25 125,620 9584 9589.0 9590.5
<br />26 125,860 9601 9613.1 9613.5 Village Road
<br />27 1'26,260 9612 9615.8 9 6 1 6 . 5 4 Seasons Pond Dam
<br />28 126,980 9615 9620.0 9620.2
<br />29 127,430 9625 9629.3 9629.5 Cross Section 4-4
<br />30 127,850 9632 9634.2 9635.2
<br />31 128,090 9638 9652,5 9653.0 Broken Lance Road n/s
<br />II 128,280 9643 9653.0 9653.7
<br />33 128,760 9656 9659.0 9659.8
<br />" 129,120 9661 9662.7 9664.5
<br />35 129,210 9662 9668.9 9669.6 Broken Lance Road t:/S
<br />l' 129,380 9664 9669.2 9669.9 Lb\it of St..".ly
<br />
<br />the w~ter is out of the channel, a wide band of flooding through
<br />the town, paralleling the river, will occur. The flooding
<br />compounded by the Lincoln and Watson road crossings which, if
<br />plugged with debris, also will contribute to water leaving
<br />the channel, Several residences and commercial buildings
<br />will be affected by the flood waters. Most of the flood
<br />waters return to the channel below Watson Road and above
<br />French Gulch.
<br />
<br />Damage during the Standard Project Flood would be more
<br />extensive than during the Intermediate Regional Flood due
<br />to the wider flOOdplain, greater depth of flooding, higher
<br />velocity of flow, and longer duration of flooding. Plates
<br />11 through 16 show water surface profiles of both the Inter-
<br />mediate Regional and Standard Project Floods. The depth of
<br />flow in the channel can be estimated from these illustrations
<br />aB well as from the reference points in Table 4. These
<br />elevations refer to the water level in tlw BlulJ River channel
<br />which may differ from elevations in the town Once the water
<br />has left the river channel. Sheet flooding within the town
<br />would generally not exceed a 2 foot depth. 'l'ypical or055-
<br />sections of the flood plain at selectee locations are shown
<br />on Plate 17.
<br />
<br />In addition to the potential flood hazard from the Blue
<br />River there also exists a flood hazard from the tributaries
<br />within the town, s<.lch as Lehman and Illinois Gulches. The
<br />damages caused by a flood from the tributaries can equal or
<br />exceed the damages caused by a flood on the Blue River.
<br />
<br />OBSTRUCTwr;s
<br />
<br />Bridges and culverts form obstructions to flood flows
<br />.in the study dred. Table 5 summarizes pertin'~nt: datil On
<br />these obstructions. As may be seen from Plates 4 through la,
<br />the <,ffeet of obstructions is to ril.is" th" Wilt".,. ,;urf'lce
<br />elevation upstream. Bridges ar<' susceptihle to structural
<br />
<br />C\:l
<br />
<br />ll<"'JI1:"Gf1Cr<",JiI;,,)'A.,:..io!,!-'em,"c
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