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Rainbow Lake Wilderness


General Information

Image of Rainbow Lake Wilderness

State(s): Wisconsin

County(s): Bayfield

Forest Service Administrative Unit(s):
Eastern Region (Region 9) -- Chequamegon-Nicolet National Forest

Size: 6583 acres

Elevation Range: 1,100 - 1,325 feet

Detailed wilderness information: http://www.wilderness.net

GIS Map/Official Boundary: http://www.wilderness.net/NWPS/

Data:

Contacts

Documents

Resource Concern Thresholds

AQRV Type: WATER
Sensitive Receptor Sensitive Receptor Indicator Thresholds
Aquatic Organisms Chemistry Total sulfur plus 20% of nitrogen deposition at levels exceeding 9.0 kg/ha-yr may cause ANC loss that would impact aquatic organisms. Levels below 4.5 kg/ha-yr are not expected to significantly impact aquatic organisms.
Aquatic Organisms Chemistry Sulfur deposition may significantly impact aquatic organisms at levels above 7.5 kg/ha/yr. Levels below 3.5 kg/ha-yr are not expected to significantly impact aquatic organisms.
Perennial Lakes and Streams Chronic Acid Neutralizing Capacity To maintain healthy biological functioning in perennial lakes and streams, the chronic acid neutralizing capacity must be >= 25 ueq/l. ANC's below 10 ueq/L (the red line) are expected to cause adverse effects.
Perennial Lakes and Streams Episodic Acid Neutralizing Capacity To maintain healthy biological functioning in perennial lakes and streams, the episodic acid neutralizing capacity must be >= 0 ueq/l.
Perennial Lakes and Streams Metals (Hg) Concentration In perennial lakes and streams, the concern threshold for mercury in fish tissue is .05 parts per million mercury in wet weight, skin-on filet.
Pollutant Exposure Concern Thresholds
Pollutant Exposures Level Name Thresholds
Nitrogen EXCEEDANCE The Deposition Analysis Threshold for nitrogen deposition is 0.010 kg/ha/yr for new or modified sources. Below this, estimated impacts from a source greater than 50km from a mandatory federal Class I Area are considered negligible, and no further analysis will be required for nitrogen.
Q (Sum of SO2+NOx+PM10+H2SO4) QOverD For new or modified sources locating greater than 50 km from a Class I area, its impacts will be considered negligible with respect to Class I AQRVs if its total SO2, NOx, PM10, and H2SO4 annual emissions in tons/yr, based on 24-hr maximum allowable emissions, divided by the distance (km ) from the Class I area (Q/D) is 10 or less. For sources operating less than a year, the emissions must be adjusted to reflect what the emissions would be if the source operated year-round.
S +20% N DEPOSITION Total sulfur plus 20% of nitrogen deposition at levels exceeding 9.0 kg/ha-yr may cause ANC loss that would impact aquatic organisms. Levels below 4.5 kg/ha-yr are not expected to significantly impact aquatic organisms.
Sulfur DEPOSITION Sulfur deposition may significantly impact aquatic organisms at levels above 7.5 kg/ha/yr. Levels below 3.5 kg/ha-yr are not expected to significantly impact aquatic organisms.
Sulfur EXCEEDANCE The Deposition Analysis Threshold for sulfur deposition is 0.005 kg/ha/yr for new or modified sources. Below this, estimated impacts from a source greater than 50km from a mandatory federal Class I Area are considered negligible, and no further analysis will be required for sulfur.

Natural Background Visibility

Site Specific Rayleigh scattering coefficient: Clearest 20% Natural Clearest 20% 2000-2004 Baseline Haziest 20% Natural Haziest 20% 2000-2004 Baseline Average Annual Natural Annual Average 2000-2004 Baseline
Standard Visual Range (km)            
Haze Index (dv)            
For more information on these numbers, click here.