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Water Quality

Past Integrated Reports

2004 Integrated Report - Search

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The 2004/2006 Integrated Report assessment database contains information on:

The report database updates the 1998 and 2002 databases and 303(d) lists. The listing status from prior assessments may be carried forward if no new or insufficient new information was available for a waterbody.

Information in the assessment database is organized by:

  • Record ID - A unique combination of waterbody location, pollutant parameter, and season.
  • Location - A stream, lake, or reservoir identified by an LLID number (derived from the latitude/longitude at the mouth of the waterbody) and the starting and ending river miles for the waterbody or segment of the waterbody. RM 0 is the mouth of the stream or center of a lake/reservoir.
  • Pollutant/Parameter - A pollutant that may impair water quality and has an Oregon water quality standard.
  • Season - The season, such as Summer or Fall Winter Spring, or a time period when the pollutant may be present.

Each unique record will have other information including:

  • Criteria - Summary of Oregon water quality criteria for the pollutant.
  • Beneficial Use - Beneficial use protected by the pollutant standard.
  • Status - An assessment category assigned to each record based on evaluating water quality information using the assessment methodology decision rules.
    • Category 1: All standards are met. (This category is not used.)
    • Category 2: Attaining - Some of the pollutant standards are met.
    • Category 3: Insufficient data to determine whether a standard is met.
      • 3B: Potential concern - Some data indicate non-attainment of a criterion, but data are insufficient to assign another category.
    • Category 4: Water is water quality limited but a TMDL is not needed. This includes:
      • 4A: TMDL approved - TMDLs needed to attain applicable water quality standards have been approved.
      • 4B: Other pollution control requirements are expected to address all pollutants and will attain water quality standards.
      • 4C: Impairment is not caused by a pollutant (e.g., flow or lack of flow is not considered a pollutant.)
    • Category 5: Water is water quality limited and a TMDL is needed, Section 303(d) list.
  • Assessment Year and Action - Year the assessment was done and what action was taken.
  • Supporting Data - Summary of the monitoring site data or other information that was evaluated.

Search criteria options:

  • Full report - Use the default "All" selections. (The report may take a while to load as there are around 18,000 records.)
  • Limited report - Select by Subbasin (4th Field Hydrologic Unit Code (HUC)), Waterbody (Stream/Lake), Pollutant, and/or Listing Status.
  • Water quality limited waterbodies (Appendix A) - Select a category 4 or 5 Listing Status.
  • 2004/2006 303(d) list - Select Listing Status: "Water Quality Limited TMDL needed - 303(d)".
  • Delisted waters - Select the Listing Status "Delisted in 2004". Search may be for all delisted waterbodies, or be limited by Subbasin, Waterbody, and/or Pollutant.

NOTE: Large rivers (Willamette River, Columbia River, Deschutes River, etc.) may be in more than one watershed. Select "CROSSES SUBBASINS" for the Subbasin name, or search by Waterbody name.