Technical Work Group 

Chair Report 

Adaptive Management Work Group Meeting 

August 17, 2023 

Seth Shanahan 

TWG Chairperson 
Meetings 

• Past 

• June 14-15, 2023 (June 16 tour) 

• August 9, 2023 (special meeting) 

• Future 

• October 11-12, 2023 (in person) 
August 1, 2023 

DRAFT 

Glen Canyon Dam Adaptive Management Program 

Adaptive Management Work Group Meeting, August 16-17, 2023 

Lttle America, 2515 East Butler e 

Flagstaff, Z 86004 

Wednesday, August 16, 2023 

Day I Webinar Information: 

https:/ /rec. webex.com/rec/j .php?MTID=m67fef4d2de6569962b5cf3 f6100b20ca 

Telephone: 415-527-5035 Passcode: 2762 308 0111 

START 

TIME 1 

(Duration) 

9:30 

PDT/MST 

10:30 MDT 

(:45) 

Draft Agenda 

Wednesday,August16,2023 

Topic, Presenter, and Purpose2 

Welcome and Administrative: Wayne Pul lan, Acting Secretary's Designee to 

the Adaptive Management Work Group 

• Introductions and Determination of Quorum (13 members) 

o Facilitator: Terra Alpaugh, Kearns & West 

• Approval of May meeting minutes 

• Review May meeting evaluation 

• Administrative 

Items Reported 

Elsewhere on 

AMWG Agenda 

• Basin hydrology, operations, and 

water quality 

• Basin Fund and hydropower

customer impacts 

• HFE Protocol 

• Trout fishery impacts 

• April 2023 HFE 

• Budget and work plan 

• SMB and other invasive fish 

planning 

• SMB EIS and 07G SEIS 
Elections/Appointments 

Seth Shanahan, Michelle Garrison, Jeremy Hammen, 

TWG Chairperson TWG Vice- Reclamation 

Chairperson Vice-Chairperson 
What was the purpose of the Bug Flows Experiment? 

To see if a modified release 

pattern would: 

• Increase midge abundance 

• Increase EPT 

abundance/diversity 

Mechanism: improved egglaying conditions 

https://www.usbr.gov/uc/progact/amp/amwg/2018-08-22-amwg-meeting/Attach_04.pdf 
Conclusions 

"Enhances natural processes}/ by 

reducing flow fluctuations? 

o cover 

But does the data indicate a 

statistically significant increase in: 

• Midge abundance, or 

• EPT abundance/diversity 

Did we see: 

X •Smoothing in midge 

distribution? 

•Caddis distribute away from 

https:/ /ww 1. 1.1sbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126- tributaries? 

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27% 

P<0.001 

Bu-g Flows years 

20% 

40'% 38% 

I

0% 

20% 

~lEPT In Onl!lld ~ny,orl IIOM '1!'-llCIII 2.(ri2-;Hl2:2 

. 

l 0% 

!ii ! l g i 2012 2014 20'16 2018 2020 I . . D -

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Bug Rows ye1,1rs 

T 
U.S. Department of the Interior

U.S. Geological Survey

Risk to campers on tributary debris fans of the Colorado River 

in Grand Canyon, AZ from known debris flow hazards

Risk Community of Practice

Monthly Meeting

June 15, 2023

Paul Grams 

Erica Byerley, Tom Gushue, Joe Thomas, and Jason Kean

U.S. Geological Survey

Southwest Biological Science Center

Grand Canyon Monitoring and Research Center
Risk Project – Motivation and Goals 

• Despite general awareness of the hazard, there is no 

formal warning system (remote location) or program 

to communicate the risk to visitors to Grand Canyon 

• Purpose of this project: 

• Elevate the understanding of debris flow and flash flood risk 

to visitors to the river corridor in Grand Canyon 

• Create a risk assessment using existing data 

• Engage with stakeholders to describe the risk assessment 

and develop a plan for communicating the risk to the public 
 

U.S. Department of the Interior 

U.S. Geological Survey 

Waterfalls in Reservoirs: Tracking the Development of 

Nickpoints in the Sediments of Declining Reservoirs 

Paul Grams, Robert Tusso, and Matt Kaplinski 

U.S. Geological Survey, Grand Canyon Monitoring and Research Center 

Chris Wilkowske and Scott Hynek 

U.S. Geological Survey, Utah Water Science Center 

Jamie Macy 

U.S. Geological Survey, Arizona Water Science Center 

Mike DeHoff and Peter Lefebvre 

Returning Rapids Project 

Willow flycatcher and clapper rail surveys 
I 

Tour of Glen Canyon Dam and -12 Mile Slough 

• June 16 

• Optional 

• First come, first serve (20 max) 

• Thanks to: 

• National Park Service 

• Bureau of Reclamation 

• Glen Canyon Conservancy 

• Grand Canyon Monitoring and 

Research Center 
















Future TWG Agenda Items 

• Monitoring metrics 

• Lake Powell hydroacoustics and fish survey update 

• Fish exclusion update 

• Pre-dam invertebrate assemblages 

• Natal origins of brown trout in Grand Canyon 

• Fall HFE webinar 

• Budget priorities 

• Smallmouth bass response 

• Incentivized harvest program