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INSPECTION JAM AND RESERVOIR IN CERTIEIED STATUS

Name of Dam Tiger Creek Forebay Dam No. 97?126

 

 

Date of inspection 10/26/2016

 

Observations and Comments

 

Outlet

Seepage

L094

 

arrangements during the next inspection to inspect the spillway chute.

The controllers for
the upstream gate and the valve appeared well maintained and were cycled in
presence during the 6/14/2016 inspection.

Typical long term staining and calcification was observed at the concrete bays of the
dam. There are two 90-degree v-notch seepage-measuring weirs located at the toe of
the dam. Seepage is collected from each bay and diverted to these weirs for measurements. The
following seepage measurements were taken during this inspection: Weir lVl-40A: ~2 and Weir
M-4OB: ~04 gpm. Both reading are within the historical range and are considered normal. Water
has been observed emanating around the wiers in the past inspection reports. has done
vegetation clearing around the weirs and they wilt be addressing the bypassing flows in the near
future. The previously mentioned seepage at the far left gravity dam remains unchanged. This
seepage is not a dam safety concern at this time

instruments at the dam consist ofthe 2 seepage weirs and 14 survey monuments. The latest data
submittai was dated April 29, 2016, covering the data from 1983 to 2015. My review of the data is
summarized below.

Seepage: There are two 90-degree v-notch seepage?measuring weirs at the dam and are named
Weir (left of outlet) and Weir M-4OB (right of outlet). The two weirs measured maximum
seepage flow rates of 16.4 and 12.2 during the review period of 2015. Both the weirs
measured minimums of 0.4 for the 2015 review period. Typically, both the weirs follow the
reservoir water levels and decrease during late summer months. The seepage followed the trends
of the past and remains within normal ranges.

Survey Monuments: The most recent data from 2011 was reviewed in the 8/15/2012 inspection
report. The report concluded the monument data does not display any unusual trends and no
abnormal settlement or horizontal movements were noted from the submitted data. The next
sUrvey will be performed in late 2016 and the data will be submitted with the 2016 instrumentation
report.

Conclusion: The available instrumentation data indicates the dam is performing satisfactorily. The
current instrumentation network is judged adequate.

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INSPECTION DAM AND RESERVOIR IN CERTIFIED STATUS

Name of Dam Tiger Creek Regulator Dam No. 97-104

Observations and Comments

Seepage

 

 

 

 

Date of Inspection 9/16/2014

 

 

   
 
 

The

  

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vaive

     
 

The
valve is not cycled annually due to strict ramping rate restrictions. The owner makes in?stream flow
releases via a near the end of the outlet pipe. The -pipe is

equipped with

We reminded the owner during this inspection that the gate and

valve need to be fully cycled annually and in our presence every three years. PGE is reportedly
currently working on developing an annuai environmental variance, so the gate and valve can be
fully cycled to meet our requirements. This variance needs to be acquired by summer 2015, so we
can witness the outlet controls being fuliy cycled during our next annual inspection.

 

valves.

The typical dampness, staining, and minor calcification were observed within the bays.
No unusual conditions were noted. Seepage is collected at two weirs, Weir A and Weir B. Weir A
measures seepage from the left half of the dam, Bays 16~23. Weir measures seepage from the
right half of the dam, Bays 1?14. The following seepage readings were taken during this inspection:

Weir A 01? (~37 gpm)
Weir 0.04 0.4 gpm)

A trickle of flow was observed from the left hillside contributing to the Weir A reading. The readings
are considered normal.

Wet spots were observed at the left gravity section of dam, left of the spillway channel.
Live flow was observed emanating from a joint at approximately 3 gpm. This condition has not
been previously reported. The condition needs to be closely monitored.

Wet spots were also observed along two of the vertical joints on the outside left spillway approach
wall with minor trickling flows observed. When comparing past inspection photos this condition has
not been present; however, the reservoir was spilling and at a higher elevation on this date. These
conditions need be monitored, but did not appear to be unusual.

Instrumentation at this dam consists of seepage weirs and survey monuments. The latest
instrumentation report was submitted with an owner?s letter dated May 5, 2014, for calendar year
2013.

Seepage Weirs: The dam has two seepage weirs. Data has been recorded since 1983. In 2013,
data peaked at 3.8 for Weir and 3.0 for Weir A. This is within the historical range of
data. Recorded data is typically below 10 with some occasional spikes. The weir readings are
considered normal and display no concerning trends.

Survey Monuments: The dam has a total of 17 survey monuments, 3 used as control points.
Surveys are performed every 5 years. The latest survey was completed in 2011, and reviewed in
the 8/15/2012 inspection report. Both horizontal and vertical movements were considered minimal.

The dam is performing satisfactorily, and no additional instrumentation is deemed necessary at this
time.

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INSPECTION UF DAM AND RESERVOIR IN CEREI STATUS

Name of Dam Tiger Creek Regulator Dam No. 97?104

 

Date of Inspection 9/24/2013

 

Observations and Comments

Seepage

Instr.

 

be contacted prior to the next scheduled cycling.

Typical staining and calcification was observed in the bays. No abnormal conditions
were noted, as observed the typical dampness and standing iron oxide colored water within the
bays. Minor calcium carbonate build up was observed in bays 15 and 21. There are a total of 
bays along the face. Seepage within bays 1-14, on the right half of the dam, is
channelized and measured at Weir B. Seepage within bays 16-2?on the left half of the dam, is
channelized and measured at Weir A. The following seepage measurements were recorded during
this inspection:

Weir A, 90? v-notch: 0.10? (~37 gpm)
Weir B, 90? v-notch: 0.04? (~0.38 gpm)

This is within the typical range of seepage and conditions are considered normal. Vegetation
around Weir A has satisfactorily been kept clear as requested. Approximately 0.5 of flow
measured at Weir A can be attributed to hiilside seepage.

Instrumentation at this dam consists of seepage weirs and survey data. The latest instrumentation
report was submitted with an owner?s letter on March 29, 2013, covering calendar year 2012.

Seepage Weirs: Seepage data has been recorded since 1983. Historically, seepage at Weir A has
generally been less than 8 and seepage at Weir has generally been less than 12 gpm, with
the exception of some historical peak points. Seepage over the last year has peaked 3.8 and 2.2
for Weirs A and B. No adverse seepage trends are noted and the seepage conditions are
considered normal. 

Survey Monuments: The dam has 17 survey monuments. Surveys are performed every 5 years.
The latest survey was performed in 2011, and reviewed in the 8/15/2012 inspection report. Both
horizontal and vertical movements were considered minimal.

The dam is performing satisfactorily, and no additional instrumentation is deemed necessary at this
time.

DWR1261 (rev.10/09) Sheet 2 of 2

 

 

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DEPARTMENT OF REES-URGES
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RECETTQN 23AM AME REETERVQER: EN. STATES

 

 

 

 

 

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INSPECTION OF DAM AND RESERVOIR IN CERTII STATUS

Name of Dam Tiger Creek Regulator Dam No. 97-104

Date of inspection 8/15/2012

Observations and Comments

Seepage

 

Typical staining was observed in the bays. A total of 2% bays exist at the dam, bays 1
througlg14 on the right half and 15 through Zagon the left half. Bays 1 through 6, 15 through 18,
and 28 were observed to be dry. Bays 7 through 4 had standing water with minimal seepage
flows that collected at Weir B. Bays 19 through were observed to be wet with live flow which is
collected at Weir A. The following seepage measurements were taken during the inspection:

Weir A, 90? v-notch: 0.09? (~2.85 gpm)
Weir B, 90? v-notch: 0.05' (~07 gpm)

has cleared the vegetation around Weir A as requested in the last inspection report. it is
now apparent that approximately 0.5 ofthe measured seepage at the weir may be attributed to
hillside seepage. Both readings are considered normal and within the historical norms.

Instrumentation at this dam consists of seepage weirs and survey data. Historically no formal
submittal has been required for this dam, but has started submitting data annually for our
review. The Division?s database will be updated to show there are now instrumentation reporting
requirements for this dam. The latest instrumentation data was submitted with an owner?s letter on
May 31, 2012, covering data for caiendar year 2011.

Seepage Weirs: The dam has two 90? v-notch seepage weirs, Weir A and B. Weir A has
historically ranged from 0 to 12.2 and peaked at 3.8 in 2011. Weir has historicaliy
ranged from 0.4 to 142 and peaked at 8.8 in 2011. This is the highest the seepage
recorded at Weir since 2005; however, the reservoir level has also increased to its highest ievel
since that time. The seepage readings are considered normal and follow historical patterns.

Survey Monuments: The dam has 17 survey monuments, 14 measuring horizontal and vertical
movements and 3 used as bench marks. Surveys are performed every 5 years. The latest survey
was performed in 2011. All verticai movements since the last survey in 2005 and the baseline
survey in 1995 have been less than 0.01 feet. Each monument experienced a 0.01 foot
movement since the last survey with the exception of monument 9 which moved 0.02
feet Since 1995 all movements have been less than or equal to 0.02
feet. Both the horizontal and vertical movements are considered minimal.

The dam is performing satisfactorily, and no additional instrumentation is judged necessary at this
time.

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