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Rainbow Lake Wilderness |
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General Information
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/
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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 below which estimated impacts from a source are considered negligible is 0.010 kg/ha/yr. |
| 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 below which estimated impacts from a source are considered negligible is 0.010 kg/ha/yr. |
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) |
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| Haze Index (dv) |
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| For more information on these numbers, click here. |
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