FLOOD10208

• County: Montrose
• Community: Montrose
• Stream Name: Uncompahgre River
• Basin: Gunnison
• Title: Flood Control and Drainage Plan
• Date: 5/1/1980
• Prepared For: Montrose County
• Prepared By: Gingery Associates, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

CroS5in~catio~

TABLE 2
STREAM C.~OSSING DATA

storr' sewer system are too small to carry signifiont flo... Virtu~lly none
of the exi5ti~g 5torm sewers provided within the City are adequate to in-
tercept dnd convey the runoff generated by the 5~year freque~cy storr". A
su.rrrnary of the existi~g stornl ~ewer syste'1ls and 1 imi ting ca::>ilci ties are
listed in Table 3.
The street curb ~nd gutter system f~nction5 as the primary drainage
system for the urba~ized part of Montrose. The streets have various con-
veyance capacities due to varying cross~sections, crown slope, and presence
(or lack) of curb and gutter. Additionally, successive asphalt overlays
over the years have further 1 imite~ street carrying capacity. These fac~
tors contribute to the need for a larger storm sewer system than otherwise
would be necessary were the street section reasonably uniform and houses
placed well a~ve the top of the curb,
The street sy<;tem is generally inadequate tocont.ain the5-year st(lIT.l
runoff at.a flow depth less than Uw curb hei'lilt (6"), '....hicil is the stJnd~rd
basis for design (Referem:el).
A ~.ap of the exi sting stOrlll -s~wer i, snown in Figure 3.

Crossing
Station

Maximum Capacity
Before Overtopping
(Cf5)

Storm Frequency
Corresponding to
Capaeity(~

Crossino

CEOARCREEK

Highway 50
Rd. 6450
Rd. 6530
N.3rdSt.
Main Street
Hillcrest Or.

~1Or;TROS E ARROYO
N. lthStreet
MainSt..N.lstSt.
S.lstSt.
S.4th-S.2ndSt.
S.5thSt.
S.6thSt.
S. lthSt.
S.8thSt.
S.9thSt.
S.12thSt.

20+00 11' OIP l80Defs 45
209+00 15' eMP 3200efs 285
285 + 00 10' CI~P lOOOcfs 67
300+75 18' x7.4' BR 900cfs 53
314 + 00 51' x6' BR Not Limiting Not Limiting
345+00 10' W? 750cf5 40

26 , 50 7' CMP S20efs 33
55 , 00 7' C!P/6'RCP 700cf5 40
57 . 50 5.25' x 5.75' RCBC 525 cfs 15
69 . 10 4.5'CI1P/6'x5. 5'BC 20Gefs 4,3
75+00 6' G1? 400 efs 16
80 + SO 7' CMP 425cfs 17
B4+25 5.5' CMP 250cfs 6.8
91+50 15.75' x7.5' 5PM lOOOcfs 83
95+80 5.5'eM? 250cfs 6,8
107+00 8' x 3.25' ~CRC 355cfs 11

DRY CEDAR CREEK
Highway 550 " .", 64' . ?4.,' "' ~~t Lirlitirg 'lot L i~iti~g
Wood gate Rd. 37 >60 36' , 21.5' B6 Not Limiting Bot Limiting
Lout5enhizer Cnl. 56 . 60 75' , 15' OF ~~ot Li mit i ng B't Limiting
Otter Bd, 115 >CO 18' , 17' liBC 20aOcfs 175

KEY:

BC Box Culvert (Stone Lined)
SR Bridge
CIP Cast Iron Pipe
eMP Corrugated Metal Pipe
OF Overhead Flume
RCP ReinforcedConcretePil:>e
RCSC Reinforced Concrete Box Culvert
SPPA Str~ctura 1 Plate Pip~ Arch
W8C Wood Box Culvert

-11-

Source: It,'~~c Tri;:j Ltj., flo;;~~lain :nfur"",tiUiL ~nd :':rb(i~ Cr"inagl,; ~ep'Ht

(R,;ff'r,;ncel)