Official Government Website
Swan Falls Settlement
Settlements
- Lemhi River Basin Settlement
- Niagara Springs Settlement
- SRBA Settlement Agreements
- Surface Water Coalition – Idaho Ground Water Appropriators, Inc. 2015 Settlement Agreement
- Surface Water Coalition, Idaho Ground Water Appropriators, Inc., and Signatory Cities 2019 Settlement Agreement
- Swan Falls Settlement
Notice
Water right changes made under the provisions of a drought declaration expire at the end of the current year unless extended or terminated by the IDWR Director.
Swan Falls Settlement Overview
In October 1984, the Swan Falls Agreement resolved an ongoing dispute between the Idaho Power Company and the State of Idaho over how to balance agriculture water use with hydropower needs in the Snake River Basin. The Agreement established minimum stream flows at the Murphy Gage near the Swan Falls Dam of 5,600 cfs during the non-irrigation season (November 1 – March 31) and 3,900 cfs during the irrigation season (April 1 – October 31). It also created a block of “Trust Water” available for new appropriations through what are now referred to as “Trust Water Rights” (TWR). The Agreement was reaffirmed by all parties in 2009. When stream flow in the Snake River at the Murphy Gage falls below the established minimums, TWRs may be subject to curtailment.
In May 2026, IDWR released the Trust Water Rights (TWR) Interactive Map. This tool, developed for Trust Water Right holders, watermasters, and water resource managers, complements the resources available on this website. The TWR Interactive Map supports priority administration of TWRs with two key features: real-time flow data at the Swan Falls Dam and detailed TWR information, including location, water source, diversion amounts, and associated Water District information.
Adjusted Average Daily Flow (AADF) Calculations
For regular AADF updates to your email or cell phone, please subscribe to IDWR’s Adjusted Average Daily Flow Report.
Archived Historical AADF Graphs
Swan Falls Implementation Group (SFIG)
Upcoming Meetings
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SFIG Key Documents
SFIG Charter – August 18, 2022
Framework Reaffirming the Swan Falls Settlement – March 25, 2009
Summary of the Swan Falls Settlement Reaffirmation jointly prepared by the State of Idaho and Idaho Power Company – April 13, 2009
Trust Water Rights (TWR)
Trust Water Rights Analysis – February 17, 2023
- 2025 Trust Water Rights List
- 2025 Trust Water_Apps for Permits and Ownership Changes_Final Query Results
- 2022 Trust Water Rights List
Technical Working Group (TWG) Framing Questions & “The 5 Questions”
The TWG Framing Questions outlined in the following linked documents are in DRAFT form and are not a final product of the SFIG.
IDWR Summary of IPC and IGWA’s TWG Framing Questions DRAFT – February 19, 2025
IPC TWG Framing Questions DRAFT – May 16, 2023
IGWA TWG Framing Questions DRAFT – March 17, 2023
Technical Analysis Objectives aka “The 5 Questions” – May 17, 2022
Meeting Documents
- Meeting Agenda – May 26, 2026
- Meeting Agenda – March 24, 2026
- Meeting Minutes
- 2026 SFIG Trust Water Update
- AADF Update
- Memo – SFIG Question #5
- Meeting Agenda – February 19, 2025
- Meeting Minutes – Coming Soon
- AADF Review, Swan Falls Winter Forecast Tool Update, and Progress on SFIG Question #5
- 2025 Trust Water Rights Presentation
- Meeting Agenda – May 17, 2024
- Meeting Minutes – May 17, 2024
- Swan Falls AADF Update
- 2024 Trust Water Rights List
- Meeting Agenda – February 22, 2024
- Meeting Minutes – February 22, 2024
- Swan Falls AADF and Forecast Tool Update
- Meeting Agenda – March 17, 2023
- Meeting Minutes – March 17, 2023
- Swan Falls AADF Update
- TWG Question #5 Update
- Meeting Agenda – February 17, 2023
- Meeting Minutes – February 17, 2023
- Trust Water Rights Analysis –
- Swan Falls AADF Update
- Meeting Agenda – November 15, 2022
- Swan Falls TWG Memorandum Question 1 – October 24, 2022
- Meeting Agenda – October 13, 2022
- Meeting Recording– October 13, 2022
- Meeting Minutes – October 13, 2022
- Swan Falls AADF Update
- Swan Falls TWG Question 1 Update
- History of Swan Falls Settlement References, presented by Jim Tucker and Clive Strong – October 13, 2022
- Meeting Agenda – May 17, 2022
- Meeting Minutes – May 17, 2022
- Technical Analysis Objectives aka “The 5 Questions”
- Meeting Agenda – March 18, 2022
- Meeting Agenda – February 7, 2022
- Meeting Agenda – August 12, 2015
- Meeting Agenda – October 27, 2014
- Meeting Agenda – April 10, 2014
- Meeting Agenda – June 27, 2013
- Meeting Agenda – March 12, 2012
Swan Falls Technical Working Group (TWG)
Upcoming Meetings
When: February, 2026 – Time TBA
Where: IDWR State Office- 322 E. Front St., Boise, Idaho, Conference Rooms 602 C & D
TWG Documents
- Swan Falls Technical Working Group Agenda – July 29, 2025
- Swan Falls Technical Working Group Agenda – June 27, 2025
- Swan Falls Technical Working Group Agenda – May 8, 2025
- Swan Falls Technical Working Group Agenda – March 11, 2025
- Swan Falls Technical Working Group Agenda – February 11, 2025
- SFIG Question 5 Data– November 1, 2024
- Swan Falls Technical Working Group Agenda – October 10, 2024
- Swan Falls Technical Working Group Agenda – June 27, 2024
- Swan Falls Technical Working Group Agenda – May 7, 2024
- Swan Falls TWG Sign-in Sheet – May 7, 2024
- AADF Update – May 7, 2024
- Reach Gain Statistics- IPC – May 7, 2024
- Milner to Murphy Reach Gain – May 7, 2024
- Swan Falls Technical Working Group Agenda – February 15, 2024
- Swan Falls TWG Sign-in Sheet – February 15, 2024
- AADF Update – February 15, 2024
- Reach Gain Statistics- IPC – February 15, 2024
- Swan Falls Technical Working Group Agenda – November 1, 2023
- Swan Falls TWG Sign-in Sheet – November 1, 2023
- AADF Update – November 1, 2023
- Reach Gain Statistics- IPC – November 1, 2023
- SFIG Question 5 – November 1, 2023
- SFIG Question 5 Data – November 1, 2023
- Swan Falls Technical Working Group Agenda – August 3, 2023
- Swan Falls TWG Sign-in Sheet – August 3, 2023
- AADF Update – August 3, 2023
- Reach Gain Statistics- IPC – August 3, 2023
- CJ Strike Operations – August 3, 2023
- Swan Falls Technical Working Group Agenda – June 15, 2023
- Swan Falls TWG Sign-in Sheet – June 15, 2023
- AADF Update – June 15, 2023
- Reach Gain Statistics- IPC – June 15, 2023
- Swan Falls Technical Working Group Agenda – May 11, 2023
- Swan Falls TWG Sign-in Sheet – May 11, 2023
- AADF Update – May 11, 2023
- Reach Gain Statistics- IPC – May 11, 2023
- Swan Falls Technical Working Group Agenda – March 16, 2023
- Swan Falls TWG Sign-in Sheet – March 16, 2023
- AADF Update – March 16, 2023
- Swan Falls Technical Working Group Agenda – February 14, 2023
- Swan Falls TWG Sign-in Sheet – February 14, 2023
- AADF Update – February 14, 2023
- Swan Falls Technical Working Group Agenda – November 1, 2022
- Swan Falls TWG Sign-in Sheet – November 1, 2022
- AADF Update – November 1, 2022
- Swan Falls Update Presentation – IPC CJ Strike Operations – November 1, 2022
- Swan Falls TWG Memorandum Question 1 – October 24, 2022
- Swan Falls Technical Working Group Agenda – September 27, 2022
- Swan Falls TWG Sign-in Sheet – September 27, 2022
- AADF Update & Question 1 TWG Response – September 27, 2022
- Swan Falls Update Presentation – IPC July August Low Flow Statistics – September 27, 2022
- Swan Falls Technical Working Group Agenda – August 10, 2022
- AADF Update – August 10, 2022
- Swan Falls Update Presentation – IPC July Low Flow Statistics – August 10, 2022
- Swan Falls TWG Sign-in Sheet – August 10, 2022
- Swan Falls Technical Working Group Agenda – July 12, 2022
- AADF Update – July 12, 2022
- Swan Falls Update Presentation – IPC Cloud Seeding – July 12, 2022
- Swan Falls TWG Sign-in Sheet – July 12, 2022
- Swan Falls Technical Working Group Agenda – June 7, 2022
- Swan Falls TWG Sign-in Sheet – June 7, 2022
- Swan Falls Update Presentation – AADF Update – June 7, 2022
- Swan Falls Update Presentation – Snake River Return Flows – June 7, 2022
- Swan Falls Update Presentation – Swan Falls Trust Water – June 7, 2022
- Swan Falls Implementation Group Assignment – June 7, 2022
- Swan Falls Update Presentation – Swan Falls Trust Water Impact – June 7, 2022
- Swan Falls Technical Working Group Agenda – May 10, 2022
- Swan Falls Update Presentation – May 10, 2022
- Swan Falls TWG Sign-in Sheet – May 10, 2022
- Swan Falls Technical Working Group Agenda – February 2, 2022
- Swan Falls Update Presentation – February 2, 2022
- Swan Falls TWG Sign-in Sheet – February 2, 2022
- Swan Falls Technical Working Group Agenda – December 8, 2021
- Swan Falls Update Presentation – December 8, 2021
- Swan Falls TWG Sign-in Sheet – December 8, 2021
- Swan Falls Technical Working Group Agenda – October 6, 2021
- Swan Falls Update Presentation – October 6, 2021
- Swan Falls TWG Sign-in Sheet – October 6, 2021
- Swan Falls Technical Working Group Agenda – June 29, 2021
- Swan Falls Update Presentation – June 29, 2021
- USGS Snake River near Murphy Update – June 29, 2021
- Idaho Power Streamgaging Update – June 29, 2021
- Swan Falls TWG Sign-in Sheet – June 29, 2021
- Swan Falls Technical Working Group Agenda – May 25, 2021
- Swan Falls Update Presentation – May 25, 2021
- Swan Falls TWG Sign-in Sheet – May 25, 2021
- Swan Falls Technical Working Group Agenda – February 23, 2021
- Swan Falls Update Presentation – February 23, 2021
- Swan Falls TWG Sign-in Sheet – February 23, 2021
- Swan Falls Technical Working Group Agenda – October 21, 2020
- Swan Falls Forecast Manual – Draft Final – October 2020
- Swan Falls TWG Presentation – October 21, 2020
- Idaho Power: CJ Strike Headwater and Data Sampling Presentation – October 21, 2020
- Swan Falls TWG Sign-in Sheet – October 21, 2020
- 2019 AADF Calculation 15 Minute Input vs Hourly Input Comparison – October 21, 2020
- 2019 AADF Calculation 15 Minute Input; CJ Strike Boat Dock vs Dam Comparison – October 21, 2020
- Swan Falls Technical Working Group Agenda – May 20, 2020
- Swan Falls TWG Sign-in Sheet – May 20, 2020
- Swan Falls TWG AADF Presentation – May 20, 2020
- Swan Falls Technical Working Group Agenda – February 20, 2020
- Swan Falls TWG Sign-in Sheet – February 20, 2020
- Swan Falls Forecast Tool Documentation Presentation – February 20, 2020
- Swan Falls Forcast Tool Presentation – February 20, 2020
- AADF Calculation 2019 and 2020 Update Presentation – February 20, 2020
- Swan Falls Technical Working Group Agenda – May 10, 2018
- Swan Falls Technical Working Group (no agenda) – March 30, 2017
- Swan Falls Minimum Flow Forecast Tool – March 30, 2017
- Swan Falls Technical Working Group Agenda – June 23, 2016
- Current Flows at the Murphy Gage – June 23, 2016
- AADF Calculation Recent Developments – June 23, 2016
- HW Sampling – June 23, 2016
- Swan Falls Technical Working Group Agenda – April 27, 2016
- Current Flows at the Murphy Gage – April 27, 2016
- Surface Area Weighted Stage Estimation in AADF – April 27, 2016
- Swan Falls Technical Working Group Agenda – March 3, 2016
- State of the AADF – March 3, 2016
- AADF Lag Time CJ to Big Foot Bar – March 3, 2016
- Weighted Average Stage Estimation – March 3, 2016
- Swan Falls Technical Working Group Agenda – December 1, 2015
- Incorporation of Stage-Storage Relationship in AADF – December 1, 2015
- AADF – CJ Strike HW Weighting Storage Calculation Analysis – December 1, 2015
- Swan Falls Technical Working Group Agenda – October 20, 2015
- Swan Falls Agreement AADF Travel Time Analysis – October 20, 2015
- Bigfoot Bar Travel Time Analysis – October 20, 2015
- AADF Lag Time Sensitivity Analysis – October 20, 2015
- AADF Stage Storage Error Analysis and CJ Strike Storage Calculation Analysis – October 20, 2015
- Swan Falls Technical Working Group Agenda – September 15, 2015
- AADF Year-to-Date Update – September 15, 2015
- AADF Measuring and Monitoring Plan Review – September 15, 2015
- Comparison of the Murphy Gage and the Swan Falls Ramp Gage – September 15, 2015
- USGS Update: Snake River below the bypass near Murphy Gage – September 15, 2015
- AADF Multiple Headwater Gage Storage Calculation Options for CJ Strike Reservoir – September 15, 2015
- Swan Falls Technical Working Group Agenda – May 28, 2015
- Observed Wind Impact on AADF Calculation – May 28, 2015
- Potential Impacts of Wind on AADF Calculated Shortfalls – May 28, 2015
- Swan Falls Technical Working Group Agenda – April 22, 2015
- Swan Falls Technical Working Group Agenda – March 18, 2015
- Swan Falls Technical Working Group Agenda – February 12, 2015
- Forecasting Snake River Discharge at Murphy – February 12, 2015
- Management Options to Maintain Minimum Flows – February 12, 2015
- Spring Flow and Reach Gain Forecasting for Middle Snake River – February 12, 2015
- Murphy Gage Flow Data – Current Conditions – February 12, 2015
- Swan Falls Technical Working Group Sign-in Sheet – February 12, 2015
- Swan Falls Technical Working Group Agenda – October 8, 2014
- Update on Calculations of the AADF in 2014 – July 14, 2014
- Swan Falls Technical Working Group Agenda – June 17, 2014
- Swan Falls Technical Working Group Agenda – December 4, 2013
- A Unique Technique for Long Range Precipitation & Streamflow Forecasting and its Applications for Spring/Aquifer Flow Forecasting – December 4, 2013
- Updated AADF spreadsheet at the Murphy Gage – December 4, 2013
- Calculation of the Adjusted Average Daily Flow (AADF) at the Murphy Gage – December 4, 2013
- Snake River below Swan Falls (Ramp gage) Snake River near Murphy – December 4, 2013
- AADF at the Murphy Gage (Hourly Method) – December 4, 2013
- Swan Falls Technical Working Group Agenda – November 5, 2013
- Swan Falls Technical Working Group Agenda – October 9, 2013
- Murphy Gage Shifts – August 20, 2013
- Swan Falls Technical Working Group Agenda – June 5, 2013
- Swan Falls Technical Working Group Agenda – May 10, 2013
- Swan Falls Technical Working Group Agenda – March 25, 2013
- Swan Falls Technical Working Group Agenda – February 7, 2013
- Potential Swan Falls Inflow Gauging Sites – Kelvin Anderson, P.E. / IPC River Engineering – January 15, 2013
- Wind Analysis – January 15, 2013
- Swan Falls Technical Work Group Meeting – October 18, 2012
- Swan Falls Technical Working Group Agenda – October 18, 2012
- Diversions out of C.J. Strike Reservoir – December 13, 2012
- Seepage Study Update – December 13, 2012
- Swan Falls Analysis – November 2012
- Seepage Survey Related Information – October 2012
- Swan Falls Technical Work Group Meeting – September 20, 2012
- Swan Falls Technical Working Group Agenda – September 20, 2012
- Murphy 2012 Bruneau River and Murphy Flows – September 19, 2012
- Removing Idaho Power Operations From Flow calculation at Snake River near Murphy – September 20, 2012
- Tentative Schedule for October 17th Field Trip – September 17, 2012
- Swan Falls Technical Work Group Meeting – August 7, 2012
- Swan Falls Technical Working Group Agenda – August 7, 2012
- Current Murphy Flow Data – August 7, 2012
- Snake River near Murphy Trends, 1914 – 2011, 1992 – 2011 – August 7, 2012
- Index Velocity Site Selection Matrix Spreadsheet – August 7, 2012
- Bruneau River Site Selection Document – August 7, 2012
- Loveridge Document – August 7, 2012
- Snake River near Murphy Measurement Summary – August 7, 2012
- Murphy and Swan Falls Shifts Over Time – August 7, 2012
- Attendance Roster – August 7, 2012
- Swan Falls Technical Work Group Meeting – June 21, 2012
- Potential Locations for a Swan Falls Inflow Monitoring Site – June 21, 2012
- C.J. Strike to Swan Falls Storage Data – June 21, 2012
- C.J. Strike to Swan Falls Flow Data July 15, 2003 – June 21, 2012
- Average annual Spring Discharge to Snake River Between Milner and King Hill – June 21, 2012
- Idaho Power Releases Spreadsheet – June 21, 2012
- Snake River near Murphy less IPCO releases from Milner – June 21, 2012
- Swan Falls Technical Work Group Meeting – April 17, 2012
- Bruneau River Diversions – April 17, 2012
- Flow Augmentation for Salmon Worksheet – April 17, 2012
- Gauge Inventory Worksheet – April 17, 2012
- C.J. Strike Worksheet – April 17, 2012
- Swan Falls Technical Work Group Meeting – February 28, 2012
- Attendance Roster – February 28, 2012
- Overview of the Swan Falls Settlement – February 28, 2012
- C.J. Strike Canal Diversion Data #1 – February 28, 2012
- C.J. Strike Canal Diversion Data #2 – February 28, 2012
- C.J. Strike Canal Diversion Data #3 – February 28, 2012
- C.J. Strike Bathymetry map from 1995 – February 28, 2012
- C.J. Strike Reservoir Area and Capacity Curves – February 28, 2012
- C.J. Strike POD Map – February 28, 2012
- Murphy Gage to Upper Salmon Falls POD Map – February 28, 2012
- Gaging Station in Snake River Basin Between C.J. Strike and Murphy – February 28, 2012
- Gaging Station in Snake River Between King Hill and Murphy and the Bruneau River basin – February 28, 2012
- Gages from Milner to Swan Falls – February 28, 2012
- Idaho Power Stream Gaging, 2009 – February 28, 2012
- Idaho Power Hydro Operations Impacts – February 28, 2012
- Lower Salmon Reservoir Volume Data – February 28, 2012
- Swan Falls M&M Meetings 2011 – February 28, 2012
- Monitoring Plan For Swan Falls Minimum Flows at Murphy Gaging Station – February 28, 2012
- Water Travel Time #1 – February 28, 2012
- Water Travel Time #2 – February 28, 2012
- Swan Falls Technical Work Group Meeting – January 24, 2012
- Attendance Roster for January 24th Meeting – January 24, 2012
- Swan Falls Monitoring and Measurement Program IDWR Goals and Perspectives – January 24, 2012
- Snake River Flow Graphs from SPF Water Engineering LLC. – January 16, 2012
- Workshop on Flow Measurement – May 14, 2009
- Workshop on Flow Measurement – June 11, 2009