U.S. DEPARTMENT OF AGRICULTURE
NATURAL RESOURCES CONSERVATION SERVICE                                                                      04/27/2000
                                           WOODLAND MANAGEMENT AND PRODUCTIVITY
                                    Napa County, California: Detailed Soil Map Legend
                         (Only the soils suitable for production of commercial trees are listed)
_________________________________________________________________________________________________________________________
|                 |      |            Management concerns             |      Potential productivity      |               |
|                 |      |____________________________________________|__________________________________|               |
| Map symbol and  |Ordi- |        |Equip-  |        |        |        |                    |     |       |               |
|    soil name    |nation|Erosion | ment   |Seedling| Wind-  | Plant  |    Common trees    |Site |Volume |Suggested trees|
|                 |symbol| hazard |limita- |mortal- | throw  |competi-|                    |index|of wood|   to plant    |
|                 |      |        |  tion  |  ity   | hazard |  tion  |                    |     | fiber |               |
|_________________|______|________|________|________|________|________|____________________|_____|_______|_______________|
|                 |      |        |        |        |        |        |                    |     | m3/ha |               |
|                 |      |        |        |        |        |        |                    |     |       |               |
|100:             |      |        |        |        |        |        |                    |     |       |               |
| AIKEN-----------| 10A  |Slight  |Slight  |Slight  |Slight  |Severe  |Douglas fir---------| 140 |   10  |Coulter pine,  |
|                 |      |        |        |        |        |        |ponderosa pine------| 148 |   14  |Douglas fir,   |
|                 |      |        |        |        |        |        |redwood-------------| --- |  ---  |Monterey pine, |
|                 |      |        |        |        |        |        |                    |     |       |ponderosa pine |
|                 |      |        |        |        |        |        |                    |     |       |               |
|101:             |      |        |        |        |        |        |                    |     |       |               |
| AIKEN-----------| 10A  |Slight  |Slight  |Slight  |Slight  |Severe  |Douglas fir---------| 140 |   10  |Coulter pine,  |
|                 |      |        |        |        |        |        |ponderosa pine------| 148 |   14  |Douglas fir,   |
|                 |      |        |        |        |        |        |redwood-------------| --- |  ---  |Monterey pine, |
|                 |      |        |        |        |        |        |                    |     |       |ponderosa pine |
|                 |      |        |        |        |        |        |                    |     |       |               |
|102:             |      |        |        |        |        |        |                    |     |       |               |
| AIKEN-----------| 10R  |Moderate|Moderate|Slight  |Slight  |Severe  |Douglas fir---------| 140 |   10  |Coulter pine,  |
|                 |      |        |        |        |        |        |ponderosa pine------| 148 |   14  |Douglas fir,   |
|                 |      |        |        |        |        |        |redwood-------------| --- |  ---  |Monterey pine, |
|                 |      |        |        |        |        |        |                    |     |       |ponderosa pine |
|                 |      |        |        |        |        |        |                    |     |       |               |
|107:             |      |        |        |        |        |        |                    |     |       |               |
| BOOMER----------| 11A  |Slight  |Slight  |Slight  |Slight  |Moderate|Douglas fir---------| 127 |    9  |Douglas fir,   |
|                 |      |        |        |        |        |        |black oak-----------| --- |  ---  |ponderosa pine |
|                 |      |        |        |        |        |        |ponderosa pine------| 125 |   11  |               |
|                 |      |        |        |        |        |        |sugar pine----------| --- |  ---  |               |
|                 |      |        |        |        |        |        |                    |     |       |               |
|108:             |      |        |        |        |        |        |                    |     |       |               |
| BOOMER----------| 11A  |Slight  |Slight  |Slight  |Slight  |Moderate|Douglas fir---------| 127 |    9  |Douglas fir,   |
|                 |      |        |        |        |        |        |ponderosa pine------| 125 |   11  |ponderosa pine |
|                 |      |        |        |        |        |        |sugar pine----------| --- |  ---  |               |
|                 |      |        |        |        |        |        |                    |     |       |               |
|109:             |      |        |        |        |        |        |                    |     |       |               |
| BOOMER----------| 11R  |Moderate|Moderate|Slight  |Slight  |Moderate|Douglas fir---------| 127 |    9  |Douglas fir,   |
|                 |      |        |        |        |        |        |ponderosa pine------| 125 |   11  |ponderosa pine |
|                 |      |        |        |        |        |        |sugar pine----------| --- |  ---  |               |
|                 |      |        |        |        |        |        |                    |     |       |               |
|110:             |      |        |        |        |        |        |                    |     |       |               |
| BOOMER----------| 11R  |Moderate|Moderate|Slight  |Slight  |Moderate|Douglas fir---------| 127 |    9  |Douglas fir,   |
|                 |      |        |        |        |        |        |black oak-----------| --- |  ---  |ponderosa pine |
|                 |      |        |        |        |        |        |ponderosa pine------| 125 |   11  |               |
|                 |      |        |        |        |        |        |sugar pine----------| --- |  ---  |               |
|                 |      |        |        |        |        |        |                    |     |       |               |
| FORWARD---------|  7R  |Severe  |Severe  |Slight  |Slight  |Severe  |Douglas fir---------| 115 |    7  |Coulter pine,  |
|                 |      |        |        |        |        |        |ponderosa pine------| --- |  ---  |Douglas fir,   |
|                 |      |        |        |        |        |        |                    |     |       |Monterey pine, |
|                 |      |        |        |        |        |        |                    |     |       |ponderosa pine |
|                 |      |        |        |        |        |        |                    |     |       |               |
| FELTA-----------| ---  |  ---   |  ---   |  ---   |  ---   |  ---   |  ------------------| --- |  ---  |  ---          |
|                 |      |        |        |        |        |        |                    |     |       |               |
|111:             |      |        |        |        |        |        |                    |     |       |               |
| BOOMER----------| 11A  |Slight  |Slight  |Slight  |Slight  |Moderate|Douglas fir---------| 127 |    9  |Douglas fir,   |
|                 |      |        |        |        |        |        |black oak-----------| --- |  ---  |ponderosa pine |
|                 |      |        |        |        |        |        |ponderosa pine------| 125 |   11  |               |
|                 |      |        |        |        |        |        |sugar pine----------| --- |  ---  |               |
|                 |      |        |        |        |        |        |                    |     |       |               |
|                 |      |        |        |        |        |        |                    |     |       |               |
| FORWARD---------|  7A  |Slight  |Slight  |Slight  |Slight  |Severe  |Douglas fir---------| 115 |    7  |Coulter pine,  |
|                 |      |        |        |        |        |        |ponderosa pine------| --- |  ---  |Douglas fir,   |
|                 |      |        |        |        |        |        |                    |     |       |Monterey pine, |
|                 |      |        |        |        |        |        |                    |     |       |ponderosa pine |
|                 |      |        |        |        |        |        |                    |     |       |               |
| FELTA-----------| ---  |  ---   |  ---   |  ---   |  ---   |  ---   |  ------------------| --- |  ---  |  ---          |
|                 |      |        |        |        |        |        |                    |     |       |               |
|135:             |      |        |        |        |        |        |                    |     |       |               |
| FELTON----------| 11A  |Moderate|Slight  |Slight  |Slight  |Severe  |Douglas fir---------| 150 |   11  |Douglas fir,   |
|                 |      |        |        |        |        |        |redwood-------------| 130 |   11  |Monterey pine  |
|                 |      |        |        |        |        |        |                    |     |       |               |
|138:             |      |        |        |        |        |        |                    |     |       |               |
| FORWARD---------|  7A  |Slight  |Slight  |Slight  |Slight  |Severe  |Douglas fir---------| 115 |    7  |Coulter pine,  |
|                 |      |        |        |        |        |        |ponderosa pine------| --- |  ---  |Douglas fir,   |
|                 |      |        |        |        |        |        |                    |     |       |Monterey pine, |
|                 |      |        |        |        |        |        |                    |     |       |ponderosa pine |
|                 |      |        |        |        |        |        |                    |     |       |               |
|139:             |      |        |        |        |        |        |                    |     |       |               |
| FORWARD---------|  7A  |Slight  |Slight  |Slight  |Slight  |Severe  |Douglas fir---------| 115 |    7  |Coulter pine,  |
|                 |      |        |        |        |        |        |ponderosa pine------| --- |  ---  |Douglas fir,   |
|                 |      |        |        |        |        |        |                    |     |       |Monterey pine, |
|                 |      |        |        |        |        |        |                    |     |       |ponderosa pine |
|                 |      |        |        |        |        |        |                    |     |       |               |
|140:             |      |        |        |        |        |        |                    |     |       |               |
| FORWARD---------|  7R  |Severe  |Severe  |Slight  |Slight  |Severe  |Douglas fir---------| 115 |    7  |Coulter pine,  |
|                 |      |        |        |        |        |        |ponderosa pine------| --- |  ---  |Douglas fir,   |
|                 |      |        |        |        |        |        |                    |     |       |Monterey pine, |
|                 |      |        |        |        |        |        |                    |     |       |ponderosa pine |
|                 |      |        |        |        |        |        |                    |     |       |               |
|141:             |      |        |        |        |        |        |                    |     |       |               |
| FORWARD---------|  7R  |Severe  |Severe  |Slight  |Slight  |Severe  |Douglas fir---------| 115 |    7  |Coulter pine,  |
|                 |      |        |        |        |        |        |ponderosa pine------| --- |  ---  |Douglas fir,   |
|                 |      |        |        |        |        |        |                    |     |       |Monterey pine, |
|                 |      |        |        |        |        |        |                    |     |       |ponderosa pine |
|                 |      |        |        |        |        |        |                    |     |       |               |
| KIDD------------| ---  |  ---   |  ---   |  ---   |  ---   |  ---   |  ------------------| --- |  ---  |  ---          |
|                 |      |        |        |        |        |        |                    |     |       |               |
|157:             |      |        |        |        |        |        |                    |     |       |               |
| LODO------------| ---  |  ---   |  ---   |  ---   |  ---   |  ---   |interior live oak---| --- |  ---  |  ---          |
|                 |      |        |        |        |        |        |                    |     |       |               |
| MAYMEN----------| ---  |  ---   |  ---   |  ---   |  ---   |  ---   |  ------------------| --- |  ---  |  ---          |
|                 |      |        |        |        |        |        |                    |     |       |               |
| FELTON----------| 11R  |Severe  |Severe  |Slight  |Slight  |Severe  |  ------------------| --- |  ---  |Coulter pine,  |
|                 |      |        |        |        |        |        |                    |     |       |ponderosa pine |
|                 |      |        |        |        |        |        |                    |     |       |               |
|163:             |      |        |        |        |        |        |                    |     |       |               |
| MAYMEN----------| ---  |  ---   |  ---   |  ---   |  ---   |  ---   |  ------------------| --- |  ---  |  ---          |
|                 |      |        |        |        |        |        |                    |     |       |               |
| MILLSHOLM-------|  1R  |Severe  |Severe  |Severe  |Moderate|Severe  |blue oak------------| --- |  ---  |  ---          |
|                 |      |        |        |        |        |        |                    |     |       |               |
| LODO------------| ---  |  ---   |  ---   |  ---   |  ---   |  ---   |interior live oak---| --- |  ---  |  ---          |
|                 |      |        |        |        |        |        |                    |     |       |               |
|_________________|______|________|________|________|________|________|____________________|_____|_______|_______________|
Forest Productivity
This table can help forest owners or managers plan the use of soils for wood crops. It shows the potential productivity
of the soils for wood crops.
The potential productivity of merchantable or common trees on a soil is expressed as a site index and as a volume number.
The site index is the average height, in feet, that dominant and codominant trees of a given species attain in a specified
number of years. The site index applies to fully stocked, even-aged, unmanaged stands. Commonly grown trees are those
that forest managers generally favor in intermediate or improvement cuttings. They are selected on the basis of growth
rate, quality, value, and marketability. More detailed information regarding site index is available in the National
Forestry Manual.
The volume of wood fiber, a number, is the yield likely to be produced by the most important tree species. This number,
expressed as cubic feet per acre per year and calculated at the age of culmination of the mean annual increment (CMAI),
indicates the amount of fiber produced in a fully stocked, even-aged, unmanaged stand.
Trees to manage are those that are preferred for planting, seeding, or natural regeneration and those that remain
in the stand after thinning or partial harvest.