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Inventory of Dams in the State of Washington

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Inventory of Dams in the State of Washington Inventory of Dams in the State of Washington This report created on: 11/23/2009 4:07 PM Revised Edition November 2009 Publication #94-16 Department of Ecology - Water Resources Program - Dam Safety Section Report Date Time: 2009-11-23 16:06 i Document Information Copies of this document may be obtained from: Publications Distribution Department of Ecology P.O Box 47600 Olympia, WA 98504-7600 (360) 407-6862 Cover Photo: Tumwater Falls Dam on the Deschutes River at flood stage. Located in Tumwater, Washington and built in 1900, the Tumwater Falls Dam is very picturesque seen from either side of the river. The Department of Ecology is an Equal Opportunity and Affirmative Action employer and shall not discriminate on the basis of race, creed, color, national origin, sex, marital status, sexual orientation, age, religion, or disability as defined by applicable state and/or federal regulations or statutes. Report Date Time: 2009-11-23 16:06 ii This Report is Based on the Entire State of Washington: Counties: 39/39, Dams: 1115/1125 39 of 39 Counties Containing 1115 of 1125 Dams in Washington Counties: Selected: Adams 1st Adams 26 dams Asotin 2nd Asotin 2 dams Benton 3rd Benton 31 dams Chelan 4th Chelan 45 dams Clallam 5th Clallam 18 dams Clark 6th Clark 28 dams Columbia 7th Columbia 10 dams Cowlitz 8th Cowlitz 19 dams Douglas 9th Douglas 21 dams Ferry 10th Ferry 11 dams Franklin 11th Franklin 25 dams Garfield 12th Garfield 2 dams Grant 13th Grant 52 dams Grays Harbor 14th Grays Harbor 19 dams Island 15th Island 12 dams Jefferson 16th Jefferson 4 dams King 17th King 121 dams Kitsap 18th Kitsap 25 dams Kittitas 19th Kittitas 20 dams Klickitat 20th Klickitat 16 dams Lewis 21st Lewis 54 dams Lincoln 22nd Lincoln 17 dams Mason 23rd Mason 20 dams Okanogan 24th Okanogan 45 dams Pacific 25th Pacific 11 dams Pend Oreille 26th Pend Oreille 40 dams Pierce 27th Pierce 58 dams San Juan 28th San Juan 52 dams Skagit 29th Skagit 21 dams Report Date Time: 2009-11-23 16:06 1 Counties: Selected: Skamania 30th Skamania 12 dams Snohomish 31st Snohomish 58 dams Spokane 32nd Spokane 34 dams Stevens 33rd Stevens 41 dams Thurston 34th Thurston 34 dams Wahkiakum 35th Wahkiakum 2 dams Walla Walla 36th Walla Walla 15 dams Whatcom 37th Whatcom 38 dams Whitman 38th Whitman 8 dams Yakima 39th Yakima 48 dams Report Date Time: 2009-11-23 16:06 2 Dam Inventory Introduction and Background Counties: 39/39, Dams: 1115/1125 Introduction Background This Inventory of Dams is now an electronic report based on a In 1972, the U.S. Congress passed Public Law 92-367 which series of publications describing the physical characteristics of authorized the development of a National Inventory of Dams. dams in Washington State. It represents a compilation of Subsequently in 1975, the Department of Ecology assembled the information that was first assembled in 1975 and has been first dam inventory. This initial inventory was published May 1976 maintained and updated since that time. in WRIS Information Bulletin No. 28. The full inventory contains 1125 dams. These dams are defined In the following years, this original inventory was updated with as structures that can impound 10 acre-feet or more of watery the assistance from the Seattle District office of the U.S. Army material at the dam crest elevation. Past publications had also Corps of Engineers. In December 1981, the second Inventory of listed dams that had been removed or breached. This report lists Dams in Washington State was published in a joint effort by the 1115 dams that are currently being operated or that have Department of Ecology and the State Energy Office. operated in the recent past and that are in the 39 counties listed on the previous page. In 1986, the U.S. Congress passed the Water Resources Development Act of 1986, Public Law 99-662, which As with any database, this inventory represents current reauthorized the fiscal support for the National Inventory of conditions to the best of our knowledge. No warranty for the Dams. Monies provided by this source and administered by the correctness, accuracy, or usefulness of this data is expressed or Association of State Dam Safety Officials (ASDSO) have implied. If errors or inaccuracies are discovered, or if you have augmented ongoing efforts to maintain and update the special accommodation needs, please contact the Dam Safety Washington inventory. Section of Ecology at (360) 407-6208 (voice) or (360) 407-6006 This inventory is now available electronically on an on-demand (TDD). basis using Microsoft SQL Reporting Services. The Dam Inventory Report can be requested from Doug Johnson, Dam Safety Supervisor at [email protected] Report Date Time: 2009-11-23 16:06 3 Department of Ecology - Water Resources - Dam Safety Background Counties: 39/39, Dams: 1115/1125 Water Resources Program - Dam Safety Section Water Resources Historical Background Under state law, the Department of Ecology (Ecology) is In Washington State, dam safety concerns were part of the responsible for regulating dams that capture and store at least normal water-rights duties in the state departments of 10 acre-feet (about 3.2 million gallons) of water or watery Conservation and Development and Water Resources. In 1970, materials such as mine tailings, sewage and manure waste. dam safety regulations were transferred to newly-created Ecology's Dam Safety Office currently oversees 996 of 1125 Department of Ecology. In the early 1980s, a separate Dam dams across the state. Through plan reviews and construction Safety Section was formed to concentrate on dam issues, inspections, the agency helps ensure these facilities are properly primarily in response to the National Dam Safety Act in 1977. In designed and constructed. To reasonably secure the safety of 1990, Ecology's Dam Safety Office was reorganized and initiated human life and property, Ecology also conducts inspections of its first long-range planning for improving dam security in existing dams to assure proper operation and maintenance. Washington. Although an additional 129 dams are large enough to qualify for Ecology oversight, they are exempted by Washington State regulation WAC 173-175-020. Report Date Time: 2009-11-23 16:06 4 Characteristics of Dams in Washington Counties: 39/39, Dams: 1115/1125 Reservoir Purposes Dam Ownership Dams and reservoirs in Washington are constructed for a variety As there are a wide variety of dam and reservoir purposes, there of purposes. From the Washington counties selected for this is a correspondingly wide category of dam owners. To help report, about 27% of the dams are constructed for irrigation or delineate the types of owners, they have been separated into domestic water supply. Another 32% of the dams are built for five categories: private, local government, public utilities, federal, recreation. The remaining 41% of the dams provide a wide and state. From the Washington counties selected for this report, variety of functions including: water quality, hydropower, flood 56% of the dams are privately owned and many of these are for control, and mine tailings storage. In addition, the larger recreational purposes. Another 31% are owned by local reservoirs are commonly multi-purpose and serve a number of governments and public utilities or irrigation districts for water functions. See Figure 1. for more details. supply, flood control, or hydropower purposes. See Figure 2. for more details. Dam Height Downstream Hazard Classification The height of the dams also varies widely. Dams in Washington The Downstream Hazard Classification system used in are categorized as small, intermediate, or large for purposes of Washington (Table 1.) is similar to the types of classification setting design criteria, identifying acceptable construction systems used throughout the United States. The purpose of the methods and scheduling periodic inspections. From the system is to provide a simple characterization of the setting Washington counties selected for this report, 508 dams are downstream of a dam to reflect the general nature of classified as Small, 494 are classified as Intermediate, and 113 consequences if the dam were to fail and release the reservoir are classified as Large. Also see Table 2. and Figure 3. for into the downstream valley. It is not intended, nor does it; reflect additional details. the condition or operational characteristics of the dam. The percentage of dams in each hazard classification is shown in Figure 4. Report Date Time: 2009-11-23 16:06 5 Characteristic Charts of Dams in Washington Counties: 39/39, Dams: 1115/1125 Report Date Time: 2009-11-23 16:06 6 Characteristic Charts of Dams in Washington Counties: 39/39, Dams: 1115/1125 Report Date Time: 2009-11-23 16:06 7 Characteristic Charts of Dams in Washington Counties: 39/39, Dams: 1115/1125 Report Date Time: 2009-11-23 16:06 8 Characteristic Charts of Dams in Washington Counties: 39/39, Dams: 1115/1125 Report Date Time: 2009-11-23 16:06 9 Characteristic Charts of Dams in Washington Counties: 39/39, Dams: 1115/1125 Report Date Time: 2009-11-23 16:06 10 Characteristic Charts of Dams in Washington Counties: 39/39, Dams: 1115/1125 Report Date Time: 2009-11-23 16:06 11 Definitions of Dam Inventory Terminology Acronyms and Abbreviations Acronyms and Abbreviations Acronym/Abbreviation Description Acronym/Abbreviation Description CO Company or County N North CONS Conservation NO Number CORP Corporation PUD Public Utilities District CR Creek R, RVR River DEPT Department RES Reservoir DIST District RR Railroad DOE Department of Energy S South E East SEC-TWP-RGE Section Township Range ELEC Electric ST Street or Saint F, FK Fork TR Tributary GEN General UNK Unknown INC Incorporated US United States IRR, IRRIG Irrigation W West LK Lake WA Washington MT Mountain or Mount WTR Water Report Date Time: 2009-11-23 16:06 12 Definitions of Dam Inventory Terminology Crest Length Downstream Hazard Class The crest length of the dam is listed to the nearest foot.
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