Lakes of Phosphorus Sensitivity Significance
Go to Section:- Overview
- Data Quality
- Data Organization
- Coordinate System
- Attributes
- Distribution - Get Data
- 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 - 06/01/2021 (pdf, 1.7 MB)
Purpose:
To support planning, natural resource management, research and other resource protection-related activities.
Time Period of Content Date:
2020
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
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.
Source Scale: Source layer wetl_dnrpy2: 100000
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).
Table Detail:
env_lakes_of_biological_significance - feature class table (DNR EWR)| Field Name | Valid Values | Definition | Definition 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 |
| PW_BASIN_NAME | - | Lake Name per DNR Ecological and Water Resources Division's LAKESDB database | DNR EWR LAKESDB |
| FLAG | enumerated | Identifies whether basin is a sub-basin or a border water | DNR EWR |
| Y | Yes, is a sub-basin; DOWLKNUM usually ends in '01', '02, '03, etc. | DNR EWR |
| N | No, is not a sub-basin. | DNR EWR |
| B | Border water | DNR EWR |
| WB_CLASS | enumerated | Hydrologic feature type; based on original USCLASS attribute from USGS 100K DLG dataset; some polygons have been reclassified to better indicate their current hydrologic state | USGS 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.pdf | DNR Fisheries |
| ACRES | - | Surface area of waterbody in acres | ESRI auto-calculated |
| SHORE_MI | - | Perimeter of shoreline in miles (includes island shoreline) | ESRI auto-calculated |
| COUNTY | - | County Name | |
| DNR_REGION | enumerated | DNR Administrative Region | bdry_dnr_admin_regions.gdb\dnr_admin_regions |
| 1 | Northwest Region (Bemidji) | |
| 2 | Northeast Region (Grand Rapids) | |
| 3 | Central Region (St. Paul) | |
| 4 | Southern Region (New Ulm) | |
| FISH_OFFICE | - | DNR Fisheries Administrative Areas (Fisheries Office) | bdry_dnr_fisheries_admin.gdb\dnr_fisheries_admin |
| MEAN_TP | - | Mean summer total phosphorus concentration for the lake (ug/l) | DNR EWR |
| MEAN_SECCHI | - | Average mean summer (June-September) Secchi transparency (m) | DNR EWR |
| PRE_DISTURB_TP | - | The predicted pre-disturbance mean total phosphorus (ug/l) using equation #2 in Jacobson et al. 2017 | 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 concentration | DNR 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 lake | DNR EWR |
| LOAD_GOAL | - | The estimated total phosphorus load (pounds/year) to meet a 5% reduction goal for the lake | DNR EWR |
| LOAD_REDUC_GOAL | - | The estimated total phosphorus load reduction (pounds/year) to meet a 5% reduction goal for the lake | DNR EWR |
| SENS_INDEX | - | A measure of phosphorus sensitivity expressed as inches lost in water clarity with an increase in 100 pounds of phosphorus loading | DNR EWR |
| LPSS_SCORE | - | The lake's phosphorus sensitivity significance (LPSS) score from 0 to 100 (low to high priority) | DNR EWR |
| LPSS_CLASS | enumerated | Grouping 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 |
| Highest | Meets Highest criteria | |
| Higher | Meets Higher criteria | |
| High | Meets High criteria | |
| Impaired | The 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
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:
06/03/2021
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