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November 14
th
, 2018
Glenwood Springs, CO
Roadmap Temperature TAC update

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Temperature TAC Meetings
TAC meeting in June 2018
Johnny Darter Study
TAC meeting in October 2018
Realized Thermal Niche
Existing Quality
TZ paper coming…
General Intro: 2

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Johnny Darter Study
Warm water winter
study white paper
recommendation
CSU-larval fish lab
CPW/CSU co-op
Similar to Red Buttes
Firkus et al 2017 study
Wild caught JDs from
CO front range streams
(WS-I streams)
3

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Johnny Darter Study
Went under contract in August 2018
Pending study results, WS-II species
are also recommended for study
4

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October TAC Meeting
Thermal niche project with CPW – Andrew Treble
Temperature paired with species location
Logger + fish pairing criteria
o
Logger is on the same CPW watercode as fish sampling site
o
Logger is within 2.000m bugger of fish sampling site
o
Sampling date is within +/- 1 year of start/end of logger date
5

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October TAC Meeting
6,443 unique logger site-fish survey site pairings
6

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October TAC Meeting
7
Potential uses
o
Determining
protective
shoulder
season
standards

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October TAC Meeting
8
Potential uses
continued
o
Criteria
refinement for
species
without
laboratory
data
o
Validation of
SSS/new lab
papers
o
Other
potential uses
95%
MWAT Temperature

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October TAC Meeting
9
Remove populations where condition factor or biologists
suggest population is not doing well
Remove populations that receive stocking
Remove reaches that receive heavy inputs from
upstream reservoir
Comparison of thermal regimes of similar stations where
species is present versus where species is absent
Look at cumulative distribution frequency of MWAT<9ºC

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Regulation Nos. 32 & 36
Temperature
Existing Quality for
Temperature
2016 WQCD proposal to replace excursions with warming
event—WQCC adopted event and kept excursions.
Warming event-degree day allowance specified in listing
methodology
EPA letter to WQCC - not likely approvable

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Regulation Nos. 32 & 36
Temperature
Existing Quality for
Temperature
Broad TAC agreement both excursions and warming event
should not be kept, letter forthcoming.

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Future TACs: Focused on Temperature
Standards Progress/Refinement
Transition zone
(next white paper)
Continue thermal
niche support work
JD Study results
Literature/Data
reviews
Temperature: 44