Reference Information

Yachats Soil Data

The links below are from the National Soil Database.  To interpret the maps, scroll down for additional information including a legend for the colors.  The term AOI refers to the "area of interest".  Hydric soils are those soils that are sufficiently wet in the upper part to develop anaerobic (lack oxygen) conditions during the growing season.  For a more complete definition of the term hydric, click here.

This page is under development.  When complete, additional instructions will be provided that will help the reader to interpret the data.

Instructions for national database - 5MB This is a detailed (64 pages) summary about the use of the national soil database.  This database has been used to examine Yachats soils.

When you open the links below, scroll down for the legend, tables, and description.  These will help you to interpret the maps.

Yachats Data:  

Map Unit Hydric Rating for Yachats

Potential Off Road Erosion Hazard

Potential On Road Erosion Hazard

Road Rating for Stability

Supplemental Information:

Drainage Systems - North Side

Plants for Stream side Stabilization

National Soil Survey Database


The following information is from the Lincoln County Soil Survey manuscript and is provided to help you understand how soil analysis is used.


This section provides information for planning land uses related to urban development and to water management.  Soils are rated for various uses, and the most limiting features are identified. The ratings are given in the following tables: Building Site Development, Sanitary Facilities, Construction Materials, and Water Management. The ratings are based on observed performance of the soils and on the estimated data and test data in the "Soil Properties" section.

Information in this section is intended for land use planning, for evaluating land use alternatives, and for planning site investigations prior to design and construction. The information, however, has limitations. For example, estimates and other data generally apply only to that part of the soil within a depth of 5 or 6 feet. Because of the map scale, small areas of different soils may be included within the mapped areas of a specific soil. 
The information is not site specific and does not eliminate the need for onsite investigation of the soils or for testing and analysis by personnel experienced in the design and construction of engineering works.  Government ordinances and regulations that restrict certain land uses or impose specific design criteria were not considered in preparing the information in this section. Local ordinances and regulations need to be considered in planning, in site selection, and in design. 

Soil properties, site features, and observed performance were considered in determining the ratings in this section.  During the fieldwork for this soil survey, determinations were made about grain-size distribution, liquid limit, plasticity index, soil reaction, depth to bedrock, hardness of bedrock within 5 to 6 feet of the surface, soil wetness, depth to a
seasonal high water table, slope, likelihood of flooding, natural soil structure aggregation, and soil density. Data were collected about kinds of clay minerals, mineralogy of
the sand and silt fractions, and the kind of adsorbed cations.  Estimates were made for erodibility, permeability, corrosivity, shrink-swell potential, available water capacity, and other behavioral characteristics affecting engineering uses.

This information can be used to:

(1) evaluate the potential of areas for residential, commercial, industrial, and recreation uses;
(2) make preliminary estimates of construction conditions;
(3) evaluate alternative routes for roads, streets, highways, pipelines, and underground cables;
(4) evaluate alternative sites for sanitary landfills, septic tank absorption fields, and sewage lagoons;
(5) plan detailed onsite investigations of soils and geology;
(6) locate potential sources of gravel, sand, earth fill, and topsoil;
(7) plan drainage systems, irrigation systems, ponds, terraces, and other structures for soil and water conservation; and
(8) predict performance of proposed small structures and pavements by comparing the performance of existing similar structures on the same or similar soils.

Building Site Development

The following relates to the degree the degree and kind of soil limitations that affect shallow excavations, dwellings with and without basements, small commercial buildings, local roads and streets, and lawns and landscaping.

The limitations are considered slight if soil properties and site features generally are favorable for the indicated use and limitations are minor and easily overcome; moderate if soil properties or site features are not favorable for the indicated use and special planning, design, or maintenance is needed to overcome or minimize the limitations; and severe if soil properties or site features are so unfavorable or so difficult to overcome that special
design, significant increases in construction costs, and possibly increased maintenance are required. Special feasibility studies may be required where the soil limitations
are severe.


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Last Modified :12/5/06
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