Arden Freitag Area Manager Dakotas Area Office 2019 Water Year Percent of Average Inflow

Top 4 years of record Jamestown Dickinson 160% • Pactola 163%

• Deerfield Heart Butte • Angostura 175% • Keyhole Shadehill 316%

Jamestown Belle Fourche • Wetest September in 87% 145 years Keyhole 642% Pactola • Fall inflow record 292% Deerfield 207% Angostura 454% Keyhole Dam and Reservoir Spillway Keyhole Dam and Reservoir Spillway

Jamestown Dam Angostura Dam Rope Team Inspection Deerfield Dam Inspection Gate Recoating Heart Butte

Safety of Dam Investigations

and

Risk Analysis

• Spillway / Conduit Construction

Trench geometry leads to poor compaction and is likely to result in internal erosion Geologic Section along conduit (1948) Heart Butte Dam Heart Butte Dam Heart Butte Dam Risk Analysis Summary • Poor conduit excavation geometry and backfill conditions. •Poor conduit foundation condition (sandstone has no cementation, fine grained, no PI, highly erodible) •Conduit joint leaks at 9+62 with evidence of material transportation. •Piezometric data and water pressure readings suggest voids may exist in the conduit foundation. •Poor foundation and backfill condition around the spillway stilling basin where potential seepage exit may exist • Annualized failure probability is two orders of magnitude above guidelines for action. McClusky Canal and South Dakota Rural Water Program

Rural Water Construction Funding ($ Millions) Enacted Request Remaining Ceiling FY 2019 FY 2020* (thru FY2018) Garrison Diversion Unit $33.0 $3.5 $231.1 Lewis & Clark $15 $0.1 $180.0

Reclamation-wide Rural Water Budget $112.5 $8.1 $1.3 Billion Garrison Diversion Unit Indian Municipal, Rural, and Industrial Construction

The GDU Indian rural water systems have a total of 10 active construction contracts totaling approximately $32 million

Twin Buttes Water Treatment Plant Selfridge tank construction on construction on Fort Berthold Reservation Standing Rock Reservation Northwest Area Water Supply Project

Current Projects • Westhope All Seasons WUD Segment 3 • Glenburn to Renville Corner Segment

Projects Under Design: • Biota Water Treatment Plant • Intake in Snake Creek Pumping Plant NAWS 4-2A pipeline contract Mni Wiconi Rural Water Supply System Mni Wiconi Rural Water Supply System

Oglala Sioux Tribe Core White River Murdo tower project under Rosebud Highway 83 Flooding progress Realignment Project Lewis and Clark Regional Water System Lewis and Clark Regional Water System

Reservoir Construction

Well Construction

Pipe Installation Eastern North Dakota Alternate Water Supply Project EIS

- Intake on McClusky Canal

- Pipe to State RRVWSP

- Biota Water Treatment Plant Eastern North Dakota Alternate Water Supply Project EIS

Dec. 15, 2019 Scoping Comments

May 2020 Draft EIS

October 2020 Final EIS Arden Freitag Area Manager Dakotas Area Office [email protected] 701.250.4242