OAR 340-041-0185
Basin-Specific Criteria (Klamath): Water Quality Standards and Policies for this Basin

(1) pH (hydrogen ion concentration). pH values may not fall outside the following ranges:
(a) Fresh waters except Cascade lakes: pH values may not fall outside the range of 6.5-9.0. When greater than 25 percent of ambient measurements taken between June and September are greater than pH 8.7, and as resources are available according to priorities set by the Department, the Department will determine whether the values higher than 8.7 are anthropogenic or natural in origin;
(b) Cascade lakes above 5,000 feet altitude: pH values may not fall outside the range of 6.0 to 8.5.
(2) Temperature. From June 1 to September 30, no NPDES point source that discharges to the portion of the Klamath River designated for cool water species may cause the temperature of the water body to increase more than 0.3°C above the natural background after mixing with 25% of the stream flow. Natural background for the Klamath River means the temperature of the Klamath River at the outflow from Upper Klamath Lake plus any natural warming or cooling that occurs downstream. This criterion supersedes OAR 340-041-0028 (Temperature)(9)(a) during the specified time period for NPDES permitted point sources.
(3) Total Dissolved Solids. Guide concentrations listed below may not be exceeded unless otherwise specifically authorized by DEQ upon such conditions as it may deem necessary to carry out the general intent of this plan and to protect the beneficial uses set forth in OAR 340-041-0180 (Basin-Specific Criteria (Klamath): Beneficial Uses to Be Protected in the Klamath Basin): main stem Klamath River from Klamath Lake to the Oregon-California Border (river miles 255 to 208.5): The specific conductance may not exceed 400 micro-ohms at 77°F when measured at the Oregon-California Border (river mile 208.5).
(4) Minimum Design Criteria for Treatment and Control of Sewage Wastes:
(a) During periods of low streams flows (approximately May 1 to October 31): Treatment resulting in monthly average effluent concentrations not to exceed 20 mg/l of BOD and 20 of suspended solids or equivalent control;
(b) During the period of high stream flows (approximately November 1 to April 30): A minimum of secondary treatment or equivalent control and unless otherwise specifically authorized by the Department, operation of all waste treatment and control facilities to maximum practicable efficient and effectiveness so as to minimize waste discharge to public waters.
(5) Time Schedule for Dam Removal.
(a) DEQ may issue a 401 Water Quality Certification for the federal license or permit authorizing the removal of J.C. Boyle Dam on the Klamath River that includes a time schedule for compliance with water quality standards, if DEQ makes the following findings:
(A) The dam removal and its associated water quality impacts will be of limited duration;
(B) The dam removal and related restoration activities will provide a net ecological benefit;
(C) The dam removal will be performed in a manner minimizing, to the maximum extent practicable, adverse impacts to water quality, threatened and endangered species, and beneficial uses of the Klamath River; and
(D) The dam removal, by the end of a specified time schedule, is not expected to cause an exceedance of a water quality standard set forth in this Division.
(b) Any 401 Water Quality Certification issued by DEQ for removal of J.C. Boyle Dam must:
(A) Be based on an application, evaluation, and public participation complying with OAR chapter 340 division 48; and
(B) Contain conditions ensuring that the dam removal:
(i) Will be performed in accordance with interim milestones and a time schedule specified in the certification;
(ii) Will be performed in a manner that, to the maximum practicable extent, minimizes adverse impacts to water quality, threatened and endangered species, and beneficial uses of the Klamath River (including the use of best practices and interim and post-removal protection, mitigation, and monitoring measures); and
(iii) Will not cause an exceedance of a water quality standard set forth in this Division by the end of the maximum period for meeting standards specified in the certification.
(6) Outstanding Resource Waters of Oregon (ORWs): Crater Lake. The current high water quality and exceptional ecological and recreation values of Crater Lake shall be maintained and protected, except as altered by natural processes or as authorized under (6)(a)-(b), below.
(a) No new NPDES discharge or increase of an existing NPDES discharge to Crater Lake shall be allowed, except a construction stormwater permit may be authorized for projects that will not have more than a short-term water quality impact.
(b) Any other new discharge to Crater Lake is prohibited if such discharge would degrade the water quality or ecological or recreation values of Crater Lake, except in the following circumstances:
(A) As needed to respond to a public health or safety emergency, including but not limited to wildfire response. The water quality impacts of such responses shall be short term and will be mitigated or rehabilitated to the extent practicable.
(B) As needed in connection with ecological restoration or water quality improvement activities where short term water quality impacts are necessary to obtain long-term restoration or water quality improvements.
(c) The Environmental Quality Commission acknowledges the mandate of Crater Lake National Park to also manage the park for the purpose of providing public access and enjoyment, as directed by the National Park Service Organic Act (16U.S.C. 1 et seq.).

Source: Rule 340-041-0185 — Basin-Specific Criteria (Klamath): Water Quality Standards and Policies for this Basin, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-041-0185.

340–041–0001
Preface 340–041–0002
Definitions 340–041–0004
Antidegradation 340–041–0007
Statewide Narrative Criteria 340–041–0009
Bacteria 340–041–0011
Biocriteria 340–041–0016
Dissolved Oxygen 340–041–0019
Nuisance Phytoplankton Growth 340–041–0021
pH 340–041–0028
Temperature 340–041–0031
Total Dissolved Gas 340–041–0032
Total Dissolved Solids (TDS) 340–041–0033
Toxic Substances 340–041–0036
Turbidity 340–041–0046
Water Quality Limited Waters 340–041–0053
Mixing Zones 340–041–0057
Implementation at Domestic Wastewater Treatment Works 340–041–0059
Variances 340–041–0061
Other Implementation of Water Quality Criteria 340–041–0101
Basin-Specific Criteria (Main Stem Columbia River): Beneficial Uses to Be Protected in the Main Stem Columbia River 340–041–0103
Basin-Specific Criteria (Main Stem Columbia River): Approved TMDLs in the Basin 340–041–0104
Basin-Specific Criteria (Main Stem Columbia River): Water Quality Standards and Policies Specific to the Main Stem Columbia River 340–041–0121
Basin-Specific Criteria (Main Stem Snake River): Beneficial Uses to Be Protected in the Main Stem Snake River 340–041–0122
Basin-Specific Criteria (Main Stem Snake River): Approved TMDLs in the Basin 340–041–0124
Basin-Specific Criteria (Main Stem Snake River): Water Quality Standards and Policies Specific to the Main Stem Snake River 340–041–0130
Basin-Specific Criteria (Deschutes): Beneficial Uses to Be Protected in the Deschutes Basin 340–041–0133
Basin-Specific Criteria (Deschutes): Approved TMDLs in the Basin: 340–041–0135
Basin-Specific Criteria (Deschutes): Water Quality Standards and Policies for this Basin 340–041–0140
Basin-Specific Criteria (Goose and Summer Lakes): Beneficial Uses to be Protected in Goose and Summer Lake Basins 340–041–0143
Basin-Specific Criteria (Goose and Summer Lakes): Approved TMDLs in the Basin: 340–041–0145
Basin-Specific Criteria (Goose and Summer Lakes): Water Quality Standards and Policies for this Basin 340–041–0151
Basin-Specific Criteria (Grande Ronde): Beneficial Uses to Be Protected in the Grande Ronde Basin 340–041–0154
Basin-Specific Criteria (Grande Ronde): Approved TMDLs in the Basin: 340–041–0156
Basin-Specific Criteria (Grande Ronde): Water Quality Standards and Policies for this Basin 340–041–0160
Basin-Specific Criteria (Hood): Beneficial Uses to Be Protected in the Hood Basin 340–041–0164
Basin-Specific Criteria (Hood): Approved TMDLs in the Basin: 340–041–0165
Basin-Specific Criteria (Hood): Water Quality Standards and Policies for this Basin 340–041–0170
Basin-Specific Criteria (John Day): Beneficial Uses to Be Protected in the John Day Basin 340–041–0174
Basin-Specific Criteria (John Day): Approved TMDLs in the Basin: 340–041–0175
Basin-Specific Criteria (John Day): Water Quality Standards and Policies for this Basin 340–041–0180
Basin-Specific Criteria (Klamath): Beneficial Uses to Be Protected in the Klamath Basin 340–041–0184
Basin-Specific Criteria (Klamath): Approved TMDLs in the Basin: 340–041–0185
Basin-Specific Criteria (Klamath): Water Quality Standards and Policies for this Basin 340–041–0190
Basin-Specific Criteria (Malheur Lake): Beneficial Uses to Be Protected in the Malheur Lake Basin 340–041–0194
Basin-Specific Criteria (Malheur Lake): Approved TMDLs in the Basin: 340–041–0195
Basin-Specific Criteria (Malheur Lake): Water Quality Standards and Policies for this Basin 340–041–0201
Basin-Specific Criteria (Malheur River):Beneficial Uses to Be Protected in the Malheur River Basin 340–041–0204
Basin-Specific Criteria (Malheur River): Approved TMDLs in the Basin: 340–041–0207
Basin-Specific Criteria (Malheur River): Water Quality Standards and Policies for this Basin 340–041–0220
Basin-Specific Criteria (Mid Coast Basin): Beneficial Uses to Be Protected in the Mid Coast Basin 340–041–0224
Basin-Specific Criteria (Mid Coast Basin): Approved TMDLs in the Basin: 340–041–0225
Basin-Specific Criteria (Mid Coast Basin): Water Quality Standards and Policies for this Basin 340–041–0230
Basin-Specific Criteria (North Coast): Beneficial Uses to Be Protected in the North Coast Basin 340–041–0234
Basin-Specific Criteria (North Coast): Approved TMDLs in the Basin: 340–041–0235
Basin-Specific Criteria (North Coast): Water Quality Standards and Policies for this Basin 340–041–0250
Basin-Specific Criteria (Owyhee): Beneficial Uses to Be Protected in the Owyhee Basin 340–041–0254
Basin-Specific Criteria (Owyhee): Approved TMDLs in the Basin: 340–041–0256
Basin-Specific Criteria (Owyhee): Water Quality Standards and Policies for this Basin 340–041–0260
Basin-Specific Criteria (Powder/Burnt): Beneficial Uses to Be Protected in the Powder/Burnt Basins 340–041–0264
Basin-Specific Criteria (Powder/Burnt): Approved TMDLs in the Basin: 340–041–0265
Basin-Specific Criteria (Powder/Burnt): Water Quality Standards and Policies for this Basin 340–041–0271
Basin-Specific Criteria (Rogue): Beneficial Uses to Be Protected in the Rogue Basin 340–041–0274
Basin-Specific Criteria (Rogue): Approved TMDLs in the Basin: 340–041–0275
Basin-Specific Criteria (Rogue): Water Quality Standards and Policies for this Basin 340–041–0286
Basin-Specific Criteria (Sandy Basin): Beneficial Uses to Be Protected in the Sandy Basin 340–041–0289
Basin-Specific Criteria (Sandy Basin): Approved TMDLs in the Basin: 340–041–0290
Basin-Specific Criteria (Sandy Basin): Water Quality Standards and Policies for this Basin 340–041–0300
Basin-Specific Criteria (South Coast): Beneficial Uses to Be Protected in the South Coast Basin 340–041–0304
Basin-Specific Criteria (South Coast): Approved TMDLs in the Basin 340–041–0305
Water Quality Standards and Policies for South Coast Basin 340–041–0310
Basin-Specific Criteria (Umatilla): Beneficial Uses to Be Protected in the Umatilla Basin 340–041–0314
Basin-Specific Criteria (Umatilla): Approved TMDLs in the Basin: 340–041–0315
Basin-Specific Criteria (Umatilla): Water Quality Standards and Policies for this Basin 340–041–0320
Basin-Specific Criteria (Umpqua Basin): Beneficial Uses to Be Protected in the Umpqua Basin 340–041–0324
Basin-Specific Criteria (Umpqua Basin): Approved TMDLs in the Basin: 340–041–0326
Basin-Specific Criteria (Umpqua Basin): Water Quality Standards and Policies for this Basin 340–041–0330
Basin-Specific Criteria (Walla Walla): Beneficial Uses to Be Protected in the Walla Walla Basin 340–041–0334
Basin-Specific Criteria (Walla Walla): Approved TMDLs in the Basin: 340–041–0336
Basin-Specific Criteria (Walla Walla): Water Quality Standards and Policies for this Basin 340–041–0340
Basin-Specific Criteria (Willamette): Beneficial Uses to Be Protected in the Willamette Basin 340–041–0344
Basin-Specific Criteria (Willamette): Approved TMDLs in the Basin: 340–041–0345
Basin-Specific Criteria (Willamette): Water Quality Standards and Policies for this Basin 340–041–0350
The Three Basin Rule: Clackamas, McKenzie (above RM 15) & the North Santiam 340–041–8033
Division 41 Tables and Figures
Last Updated

Jun. 8, 2021

Rule 340-041-0185’s source at or​.us