Metadata: Lakes of Phosphorus Sensitivity Significance

Lakes of Phosphorus Sensitivity Significance

This page last updated: 05/25/2018
Metadata created using Minnesota Geographic Metadata Guidelines


Go to Section:
  1. Overview
  2. Data Quality
  3. Data Organization
  4. Coordinate System
  5. Attributes
  6. Distribution - Get Data
  7. Metadata Reference

Section 1: Overview

Originator:Minnesota Department of Natural Resources (DNR) - Ecological and Water Resources (EWR)

Title: Lakes of Phosphorus Sensitivity Significance

Abstract: This layer was created to identify Lakes of Phosphorus Sensitivity Significance (LPSS) within Minnesota. Available lake data were analyzed to classify lakes based on sensitivity to nutrient pollution.

Phosphorus sensitivity was estimated for each lake by predicting how much water clarity would be reduced with additional phosphorus loading to the lake. A phosphorus sensitivity significance index was formulated to prioritize lakes as they relate to Minnesota Pollution Control Agency's (MPCA) policy objective of focusing on high quality, unimpaired lakes at greatest risk of becoming impaired. The phosphorus sensitivity significance index, which is a function of phosphorus sensitivity, lake size, lake total phosphorus concentration, proximity to MPCA's phosphorus impairment thresholds, and watershed disturbance, was used to determine the lake's Priority Class.

The goal of this list was to objectively prioritize lakes based on their sensitivity to phosphorus pollution. Lakes identified as nutrient-impaired or proposed for nutrient impairment listing are also included.

Many Minnesota lakes have not been sampled for lake phosphorus, and this list will be periodically revised as additional data become available.

For a detailed description of criteria and analysis used, see: Lakes of Phosphorus Sensitivity Significance - 05/14/2018 (pdf, 329 KB)

Purpose: To support planning, natural resource management, research and other resource protection-related activities.

Time Period of Content Date: 2017

Currentness Reference: Polygon re-delineations and edits are frequent and occur as needed. See the attributes DELINEATION_DATE and DELINEATION_SRC for date and source of each polygon. See CONTENT_DATE for last date of attribute updates.

Progress: Complete

Maintenance and Update Frequency: As needed

Spatial Extent of Data: Statewide

Bounding Coordinates: -97.23
-89.53
49.37
43.5

Place Keywords: Minnesota, border waters

Theme Keywords: Hydrography, Water, Lakes, Inland Waters, index, phosphorus sensitivity, watershed disturbance, MPCA phosphorus impairment threshold, nutrient loading, pollution

Theme Keyword Thesaurus:

Access Constraints: None

Use Constraints: None

Contact Person Information: Paul Radomski, GIS Data Contact
Minnesota DNR - Ecological and Water Resources Division
1601 Minnesota Drive
Brainerd, MN  56401
Phone: 218-203-4361
Email: paul.radomski@state.mn.us

Browse Graphic: Click to view a data sample.


Associated Data Sets: MNDNR Hydrography - All Water Features: https://gisdata.mn.gov/dataset/water-dnr-hydrography

MPCA Impaired Waters Viewer: https://gisdata.mn.gov/dataset/impaired-waters-viewer

(MPCA) Impaired Lakes 2010: https://gisdata.mn.gov/dataset/env-impaired-lakes-2010

Section 2: Data Quality

Attribute Accuracy:

Logical Consistency:

Completeness: Complete

Horizontal Positional Accuracy: Polygons have been improved by on-screen digitizing over DOQ and FSA imagery.

Vertical Positional Accuracy: N/A

Lineage: The lake polygons are derived from the Open Water feature class of the MNDNR Hydrography Dataset. See Associated Data Sets above.

Section 3: Spatial Data Organization (not used in this metadata)


Section 4: Coordinate System

Horizontal Coordinate Scheme: Universal Transverse Mercator

UTM Zone Number: 15

Horizontal Datum: NAD83

Horizontal Units: meters

Vertical Datum: not applicable

Vertical Units: Not Applicable

Depth Datum: not applicable

Depth Units: Not Applicable

Section 5: Attributes

Overview: Lakes of Phosphorus Sensitivity Significance (LPSS) Criteria: Phosphorus sensitivity was calculated using lake phosphorus and hydrology data. Based on the calculated phosphorus sensitivity, the significance of that sensitivity, and the presence of any negative trends in water clarity, lakes were grouped and assigned to one of three priority classes (high, higher, or highest).

Detailed Citation: For a detailed description of criteria and analysis used, see: Lakes of Phosphorus Sensitivity Significance - 05/14/2018 (pdf, 329 KB)

Table Detail:
env_lakes_of_biological_significance - feature class table (DNR EWR)
Field NameValid ValuesDefinitionDefinition Source
DOWLKNUM
-
Waterbody ID per DNR Ecological and Water Resources (EWR) Division's LAKESDB database; the DOWLKNUM may end in"00" (entire basin) or "01","02", etc. (sub-basin)DNR EWR LAKESDB
BASIN_NAME
-
Lake Name per DNR Ecological and Water Resources Division's LAKESDB databaseDNR EWR LAKESDB
FLAGenumeratedIdentifies whether basin is a sub-basin or a border waterDNR EWR
YYes, is a sub-basin; DOWLKNUM usually ends in '01', '02, '03, etc.DNR EWR
NNo, is not a sub-basin.DNR EWR
BBorder waterDNR EWR
WB_CLASSenumeratedHydrologic feature type; based on original USCLASS attribute from USGS 100K DLG dataset; some polygons have been reclassified to better indicate their current hydrologic stateUSGS 100K DLG data
Artificial Basin
Fish Hatchery or Pond
Industrial Waste Pond
Innundation Area
Intermittent Water
Island or land
Lake
Mine or gravel pit
Riverine polygon
Sewage Pond/Filtration Bed
Tailings Pond
Wetland
LAKE_CLASS
-
Lake Class per DNR Fisheries Investigational Report #417 - Schupp 1992 http://files.dnr.state.mn.us/publications/fisheries/investigational_reports/417.pdfDNR Fisheries
ACRES
-
Surface area of waterbody in acresESRI auto-calculated
SHORE_MI
-
Perimeter of shoreline in miles (includes island shoreline)ESRI auto-calculated
COUNTY
-
County Name
DNR_REGIONenumeratedDNR Administrative Regionbdry_dnr_admin_regions.gdb\dnr_admin_regions
1Northwest Region (Bemidji)
2Northeast Region (Grand Rapids)
3Central Region (St. Paul)
4Southern Region (New Ulm)
FISH_OFFICE
-
DNR Fisheries Administrative Areas (Fisheries Office)bdry_dnr_fisheries_admin.gdb\dnr_fisheries_admin
MEAN_SECCHI
-
Average mean summer (June-September) Secchi transparency (m)DNR EWR
MEAN_TP
-
Mean summer total phosphorus concentration for the lake (ug/l)DNR EWR
TARGET_TP
-
Target total phosphorus concentration for the lake (ug/l) based on an estimate of the 25th percentile of the summer mean TP concentrationDNR EWR
PREDICTED_LOAD
-
Predicted total phosphorus load (pounds/year). These estimates have large uncertainties (i.e., wide confidence intervals)DNR EWR
LOAD_TARGET
-
The estimated total phosphorus load (pounds/year) to meet target total phosphorus concentration (Target_TP) for the lakeDNR EWR
LOAD_GOAL
-
The estimated total phosphorus load (pounds/year) to meet a 5% reduction goal for the lakeDNR EWR
LOAD_REDUCTION_GOAL
-
The estimated total phosphorus load reduction (pounds/year) to meet a 5% reduction goal for the lakeDNR EWR
SENSITIVITY_INDEX
-
A measure of phosphorus sensitivity expressed as inches lost in water clarity with an increase in 100 pounds of phosphorus loadingDNR EWR
LPSS_PRIORITY_SCORE
-
The lake's phosphorus sensitivity significance (LPSS) score from 0 to 100 (low to high priority)DNR EWR
LPSS_PRIORITY_CLASSenumeratedGrouping of waterbodies was based on the lake phosphorus sensitivity significance score, which is a function of phosphorus sensitivity, lake size, lake total phosphorus concentration, proximity to PCA's phosphorus impairment thresholds, and watershed disturbance. Classes relate to the state's priority of focusing on <q>high-quality, unimpaired lakes at greatest risk of becoming impaired.</q>DNR EWR
HighestMeets Highest criteria
HigherMeets Higher criteria
HighMeets High criteria
ImpairedThe lake is listed as nutrient-impaired or proposed for nutrient-impairment listing

Section 6: Distribution

Publisher: Minnesota Department of Natural Resources (DNR)

Publication Date: 09/09/2015

Contact Person Information: Zeb Thomas, GIS Data Systems Coordinator
Minnesota Department of Natural Resources
500 Lafayette Rd
Saint Paul, MN  55155
Phone: 651-259-5637
Email: zeb.thomas@state.mn.us

Distributor's Data Set Identifier: env_lakes_of_phosphorus_sensitivity.gdb\lakes_of_phosphorus_sensitivity

Distribution Liability: The Minnesota Department of Natural Resources General Geographic Data License Agreement is online: http://www.dnr.state.mn.us/sitetools/data_software_license.html

Ordering Instructions: Please visit the download page for this dataset on the Minnesota Geospatial Commons website using the web link below (Online Linkage).

Online Linkage: I AGREE to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process, link to a service, or provide more instructions. See "Ordering Instructions" above for details.

Section 7: Metadata Reference

Metadata Date: 05/25/2018

Contact Person Information: Kristin Carlson, GIS Data Contact
Minnesota DNR - Ecological and Water Resources Division
1601 Minnesota Drive
Brainerd, MN  56401
Phone: 218-203-4362
Email: kristin.carlson@state.mn.us

Metadata Standard Name: Minnesota Geographic Metadata Guidelines

Metadata Standard Version: 1.2



This page last updated: 05/25/2018
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