Spokane River Upriver Dam and Donkey Island

Facility Site ID: 65178472 Cleanup Site ID: 4213

  • Site Status

  • Cleanup Complete-Active O&M/Monitoring

Site Background

The Spokane River drains more than 4,900 square miles in Washington and Idaho. Industries and municipal wastewater treatment plants in the watershed upstream of the Upriver Dam and Donkey Island cleanup site have discharged polychlorinated biphenyls (PCBs) into the river. Two PCB deposits in river-bottom sediments were investigated and cleaned up from 2006 to 2007 under a consent decree Ecology entered into with Avista Development, Inc. (Avista) and Kaiser Aluminum & Chemical Corporation, the parties responsible for cleanup.

Cleanup was necessary because:

  • PCBs build up in the fatty tissues of humans, fish and animals and may cause harmful health effects. 
  • Removing or containing PCBs reduces contamination in the environment and provides a safer environment for children, adults, and wildlife using these areas.

The Spokane River Upriver Dam and Donkey Island site is divided into two cleanup projects. These areas are owned by the City of Spokane, the Washington Department of Natural Resources, and the Washington Department of Parks & Recreation. They are open to the public for recreational activities.

Contaminated Sediments Behind Upriver Dam Capped 2006

Placing the Cap Behind Upriver Dam
Placing the Cap Behind Upriver Dam
Upriver Dam is located along Upriver Drive east of Greene Street in the City of Spokane. The project begins directly behind the dam and stretches east for nearly one-half mile, covering approximately 3.6 acres.

Known PCB sources to the dam area of the river include:

Under Ecology’s direction, contractors for Avista placed a three-layered cover called an engineered cap over the contaminated sediments on the river bottom. The cap is made of coal, sand, and gravel and is intended to isolate PCBs and keep contaminants from moving.

Donkey Island Contaminated Soil Excavated And Backfilled 2007

Dredging PCBs at Donkey Island
Dredging PCBs at Donkey Island
The Donkey Island project is east of Upriver Dam in wetlands and backwater channels on the north bank of the river. The project is 0.25 acres in an unincorporated area. 

Ecology provided oversight as contractors removed PCB-contaminated soil and restored the area with clean sand.  Areas disturbed during PCB removal were replanted in spring 2007.

Periodic Reviews

Ecology visited the site August 13, 2021, and used data from sediment samples taken in 2008, 2010, and 2020 to determine the remedies are still effective for the second periodic review. We are recommending further sampling and monitoring of the Upriver Dam cap because 2020 sampling results indicated PCBs are beginning to move upwards through the cap, but have not broken through. In addition, surficial sediments deposited on the cap contained elevated PCBs and heavy metals, meaning upstream contaminants are continuing to deposit at the site. The additional samples would show how much has resurfaced. Monitoring is planned to occur in 2025 to inform the next periodic review. The Periodic Review Report was available for public comment September 27 through October 26, 2021. We responded to comments from four organizations and made minor revisions to the report.

Ecology visited the site October 23, 2013, for the first periodic review. It is still owned by the State and is open to public recreation. Ecology used data from sediment samples taken in 2008 and 2010 to determine the remedies are still effective. The Periodic Review Report was available for public comment December 23, 2015, through January 27, 2016, and one question was received. Ecology answered the question in a response to comments document.

Periodic reviews are required when contamination is capped at a site. Ecology conducts reviews to make sure the cleanup still protects human health and the environment. We conduct periodic reviews about every five years.

Legal 3
Document Title Document Date Document Type
Avista Development, Inc. Consent Decree 12/31/2005 Consent Decree
Spokane River Upriver Dam and Donkey Island - Consent Decree 8/10/2005 Consent Decree
Kaiser Aluminum Corporation Consent Decree 11/26/2002 Consent Decree
Public Information 20
Document Title Document Date Document Type
Response to Comments: Second Periodic Review for Spokane River Upriver Dam and Donkey Island Site 9/21/2022 Responsiveness Summary
Spokane River Upriver Dam and Donkey Island Periodic Review - Response to Comments 1/29/2016 Responsiveness Summary
Spokane River Update 2007 URD, Murray Rd, Donkey Island, Island Complex 3/1/2007 Fact Sheet\Public Notices
Fact Sheet Upriver Dam PCB Site and Donkey Island Engineering Design Docs 6/1/2006 Fact Sheet\Public Notices
Участок Отложений PCBs в районе Плотины Upriver Dam 6/1/2006 Fact Sheet\Public Notices
Запруда Апривер “Upriver” Место “PCB” Седиментов 3/1/2005 Fact Sheet\Public Notices
How will PCBs in Sediments Behind Upriver Dam be Addressed? 3/1/2005 Fact Sheet\Public Notices
Are You Interested in the Proposed Cleanup of Sediments Behind Upriver Dam? 2/1/2005 Fact Sheet\Public Notices
TUG UPRIVER DAM ROV QHA TXUG THAAJ CHAW KWS MUAJ COV KUAS HLAU PCB SAIB ZOO LE CAAG LAWM 12/31/2004 Focus Sheet
АПРИВЕР ДАМБА НОВОЕ ОСВЕДОМЛЕНИЕ ОБ УЧАСТКЕ ГДЕ МХДФ НАХОДИТСЯ В ПОЧВЕ 12/31/2004 Focus Sheet
INFORMACIÓN ACTUALIZADA SOBRE EL SITIO REPRESA UPRIVER CON SEDIMENTOS CONTAMINADOS CON PCBs 12/31/2004 Focus Sheet
Upriver Dam PCB Sediments Site Update 8/1/2003 Focus Sheet
ВНИМАНИЕ СВИНЕЦ И МЫШьЯК В БЕРЕГОВОЙ ПОЧВЕ 7/1/2003 Fact Sheet\Public Notices
Сообщение о Рыбе в Спокен Реке 7/1/2003 Fact Sheet\Public Notices
NƠI BÙN CÁT BỊ NHIỄM CHẤT ÐỘC PCB Kế hoạch Chất Nhiễm Ðộc PCB ở Sông Spokane 10/1/2002 Fact Sheet\Public Notices
DLAIM NTAWV THOV TSO CAI KUAS MUABLUG KAWM SAIB PUAS YUAV KHU TAU 10/1/2002 Fact Sheet\Public Notices
АПРИВЕР ДАМБА УЧАСТОК ГДЕ МХДФ НАХОДИТСЯ В ПОЧВЕ 10/1/2002 Fact Sheet\Public Notices
EL BORRADOR DEL DECRETO DE CONSENTIMIENTO PARA LA INVESTIGACIÓN REMEDIADORA/ ESTUDIO DE FACTIBILIDAD 10/1/2002 Fact Sheet\Public Notices
Draft Consent Decree for the Remedial Investigation/Feasibility Study 10/1/2002 Fact Sheet\Public Notices
Aviso Sobre el Consumo de Pescado Fish Advisory 2001 PCB/Lead 3/31/2001 Fact Sheet\Public Notices
State Environmental Policy Act 1
Document Title Document Date Document Type
Determination of Non-significance for Sediment Remediation 3/22/2005 SEPA Documents
Technical Reports 12
Document Title Document Date Document Type
Second Periodic Review: Upriver Dam & Donkey Island 9/11/2022 Periodic Review (5 Year)
Upriver Dam Sediment Sampling Results Spokane River Upriver Dam PCB Sediment Site Spokane, Washington August 2020 8/1/2020 Performance/Confirmational Monitoring Plan or Report
Spokane River Upriver Dam 5-Year Review 12/22/2015 Periodic Review (5 Year)
Year 4 Upriver Dam Cap Monitoring Results 10/2/2011 Performance/Confirmational Monitoring Plan or Report
Year 2 Upriver Dam Cap Monitoring Results 4/16/2009 Performance/Confirmational Monitoring Plan or Report
Addendum to the Draft Final versions of the Remedial Investigation and Feasibility Study 7/12/2005 Site Specific Administrative Document - other (Administrative correspondence)
¿Cómo Se Solucionará el Problema de PCBs en el Sedimento detrás de la Presa Río Arriba? 3/1/2005 Site Specific Administrative Document - other (Administrative correspondence)
Draft Cleanup Action Plan Spokane River Upriver Dam PCB Site 3/1/2005 Cleanup Action Plan
Appendices to Remedial Investigation Report 2/9/2005 Remedial Action Report
Feasibility Study: Upriver Dam 2/9/2005 Feasibility Study
Focused Remedial Investigation Report: Upriver Dam 2/1/2005 Remedial Investigation Report
Memo: Results from Analyzing Metals in 1999 Spokane River Fish and Crayfish Sample 10/31/1999 Site Specific Administrative Document - other (Administrative correspondence)
There may be more documents related to this site. To obtain documents not available electronically, you will need to make a public records request.

Places to see print documents

  • Eastern Regional Office
    N 4601 Monroe St
    Spokane, 99205-1265
    Please schedule an appointment to view print documents at this location.

Contaminants 5

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Metals - Metals Priority Pollutants C
Halogenated Organics - Polychlorinated biPhenyls (PCB) S C
Non-Halogenated Organics - Phenolic Compounds S
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons S
Metals - Arsenic C
S
Suspected
C
Confirmed Above Cleanup Levels
B
Below Cleanup Levels
RA
Remediated-Above
RB
Remediated-Below
R
Remediated
This contaminant list was based on our best information at the time it was entered. It may not reflect current conditions at the site.