Select
Area
Select
Species
Select
Output
View Results
Change Map Baselayer
Google Terrain
Google Hybrid
Google Satellite
Google Street
Bing Hybrid
Bing Satellite
Bing Street
USGS Topo
State Outlines
None
View Abiotic Map Layers
N Deposition (T-Dep)
Aspect
Depth to Bedrock
% Clay in Soil
% Coarse Sand
Elevation
Soil Permeability
Soil pH
Slope Gradient
Precipitation (Annual)
Precipitation (May-Sept)
Temperature (Jan)
Temperature (July)
Temperature (May-Sept)
View CL & Exceedance Map Layers
Combined Species
Critical Load
CL
TL-LOW
TL-MID
TL-HIGH
Exceedance
EXC of CL
EXC of TL-LOW
EXC of TL-MID
EXC of TL-HIGH
Individual Species
Balsam Fir
Critical Load
Exceedance Min
Exceedance Max
Species Range
Red Maple
Critical Load
Exceedance Min
Exceedance Max
Species Range
Sugar Maple
Critical Load
Exceedance Min
Exceedance Max
Species Range
Yellow Birch
Critical Load
Exceedance Min
Exceedance Max
Species Range
Paper Birch
Critical Load
Exceedance Min
Exceedance Max
Species Range
American Chestnut
Critical Load
Exceedance Min
Exceedance Max
Species Range
American Beech
Critical Load
Exceedance Min
Exceedance Max
Species Range
White Ash
Critical Load
Exceedance Min
Exceedance Max
Species Range
Green Ash
Critical Load
Exceedance Min
Exceedance Max
Species Range
Butternut
Critical Load
Exceedance Min
Exceedance Max
Species Range
Black Spruce
Critical Load
Exceedance Min
Exceedance Max
Species Range
Red Spruce
Critical Load
Exceedance Min
Exceedance Max
Species Range
Red Pine
Critical Load
Exceedance Min
Exceedance Max
Species Range
Pitch Pine
Critical Load
Exceedance Min
Exceedance Max
Species Range
White Pine
Critical Load
Exceedance Min
Exceedance Max
Species Range
Bigtooth Aspen
Critical Load
Exceedance Min
Exceedance Max
Species Range
Quaking Aspen
Critical Load
Exceedance Min
Exceedance Max
Species Range
White Oak
Critical Load
Exceedance Min
Exceedance Max
Species Range
Chestnut Oak
Critical Load
Exceedance Min
Exceedance Max
Species Range
Red Oak
Critical Load
Exceedance Min
Exceedance Max
Species Range
Northern White Cedar
Critical Load
Exceedance Min
Exceedance Max
Species Range
Eastern Hemlock
Critical Load
Exceedance Min
Exceedance Max
Species Range
American Elm
Critical Load
Exceedance Min
Exceedance Max
Species Range
Unavailable
5000 km
3000 mi
Areas
Select Area Layer
States
Ecoregions Combined
Level II Ecoregions
Level III Ecoregions
Forest Service Wilderness Areas
Forest Service Admin Areas
Class I Areas


Welcome to the N-CLAS tool

N-CLAS facilitates assessment of risk to forest ecosystems for resource managers and policy makers. This tool is designed to calculate critical loads and exceedances for Nitrogen deposition to forests in the northeastern US. It provides high resolution outputs (maps, graphs, and tables) for multiple areas and accounts for the influence of site, climate, and topographic conditions on 23 key tree species in the region.

Getting Started

Step 1: Select your target Area

Step 2: Select your Species of interest

Step 3: Select your preferred Output format

- Basic: Summary figures and tables for most protective critical load of most sensitive species

- Tailored: Set of outputs based on your response to screening questions about your needs

- Comprehensive: All figures and tables

Step 4: View your generated Results

- Explore graph, table, and map outputs

- Download individual outputs

Legend

Add a map layer to view its legend...

Abiotic Distributions

Select an area to view distributions for its abiotic factors...
Select Abiotic Factors
N Deposition (T-Dep)
Aspect
Depth to Bedrock
% Clay in Soil
% Coarse Sand
Elevation
Soil Permeability
Soil pH
Slope Gradient
Precipitation (Annual)
Precipitation (May-Sept)
Temperature (Jan)
Temperature (July)
Temperature (May-Sept)

Downloads

N-CLAS: Nitrogen Critical Loads Assessment by Site

High resolution, spatially explicit critical load and exceedance mapping to inform sustainable forest management