Upper Los Pinos Watershed Report

• Document ID: hr_0016
• Contract/PO #: PO 06-51
• County: La Plata
• County: Hinsdale
• County: San Juan
• Stream Name: Los Pinos River
• Basin: San Juan/Dolores
• Sub-Basin: Upper San Juan 14080101
• Water Division: 7
• Title: Rainfall Runoff, Flood Hazards, and Water-Quality Data for the Upper Los Pinos River Watershed, Southwestern Colorado, 2006
• Date: 3/1/2007
• Prepared For: CWCB
• Prepared By: Southwest Hydro-Logic
• Watershed Pro - Doc Type: Planning Report

STREAM GAGING DATA
Selected stream sites were studied for stage
and rainfall nu7off response where houses and
roads could be impacted by floods from the
Missionary Ridge burn area. Stream sites were
selected by discussions with volunteers, citizens,
and the County Office of Emergency
Management. Six streams were selected where
where staff gages were installed (Figure 5). Crest
stage gages were installed at sites using 1/2"
slotted PVC, with a wetting stick inside, and cork
in the bottom of the PVC pipe. A rise in stream
stage is recorded on the stick by floating cork in
the slotted PVC.
Volunteers teamed up to collect stage data
on a daily basis, as available. A method was
developed for estimating streamflow discharge,
and classes were taught in the field for volunteers
to make discharge estimates using simple tools.
At one of the sites (South Fork Weasel Creek),
discharge and stage were determined, and from
these data, stage-discharge relationships were
developed (Figure 6). Data were not successfully
collected at Jack and Red Creeks. Streamflow
discharge and stream stage hydrographs are
shown in Figures 7 and 8.
Figure 5. Staff gage at the Jack Crcck culvert
for County Road SOIa.
STAGE-DISCHARGE RATING CURVE
SOUTH FORK WEASEL CREEK
14
D
p 12
U
w
y
w 10
a
w
w g
w
U
00
U 6
z
w
~ 4
a
x
U
y 2
D
0
DISCHARGE = 35.233`STAGE - 0.0562
RZ = 0.9981
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
STAGE, IN FEET
Figure 6. Stage-discharge relationship for determining discharge fiom
stream stage at South Fork Weasel Creek.
s~L