To conduct the visual stream assessment portion of the watershed survey, volunteers regularly walk, drive, and/or canoe along a defined stretch of stream observing water and land conditions, land and water uses, and changes over time. These observations are recorded on maps and on visual assessment data sheets and passed to the volunteer coordinator, who can decide whether additional action is needed. Volunteers might themselves follow up by reporting on problems such as fish kills, sloppy construction practices, or spills they have identified during the visual assessment.

The basic steps to follow are:

Task 1 Determine the area to be assessed

Once you have identified the area to be assessed, define it clearly in words (for example, "Volunteer Creek from Bridge over Highway One to confluence of Happy Creek at entrance to State Park"). Then, either draw the outline and significant features of the stream and its surroundings on a blank sheet of paper or obtain a more detailed map of the area, such as a plat, road, or neighborhood map. This will serve as the base map you will use to mark stream obstructions, pollution sources, land uses, litter, spills, or other problems identified during your visual assessment.

Task 2 Determine when to survey

• Early spring, before trees and shrubs are in full leaf and when water levels are generally high

• Late summer, when trees and shrubs are in full leaf and when water levels are generally low

• Late fall, when trees and shrubs have dropped their leaves but before the onset of freezing weather

Again, it is important to survey the stream at approximately the same time each season to account for seasonal variations. You might find it productive to drive through the watershed once a year and to walk the stream (or the stream's problem sites) at other times (see Tasks 4 and 5).

Task 3 Gather necessary equipment

• Reference map such as road map or USGS topographic map, to locate the stream and the area to be assessed

• Base map to record land uses, land characteristics, stream obstructions, sources of pollution, and landmarks

• Field data sheet

• Additional blank paper, to draw maps or take notes if needed

• Relevant information from background investigation (e.g., location of NPDES outfalls, farms, abandoned mines, etc.)

Task 4 Drive (or walk) the watershed

As with all other monitoring activities, you should undertake your watershed drive or walk with at least one partner. If you are driving, one of you should navigate with a road map and mark up the base map and field sheet with relevant discoveries while the other partner drives. You might want to pull over to make detailed observations, particularly near stream crossings. Remember never to enter private property without permission (see section 2.3 - Safety Considerations).

As you drive or walk the watershed, look for the following:

• The "lay" of the land--become aware of hills, valleys, and flat terrain. Does any of this area periodically flood?

• Bridges, dams, and channels--look for evidence of how the community has dealt with the stream and its flood potential over the years. Are portions of it running through concrete channels? Is it dammed, diverted, culverted, or straightened? Where the road crosses the stream, is there evidence of erosion and pollution beneath bridges? Is streamflow obstructed by debris hung up beneath bridges?

• Activities in the watershed--look for land use activities that might affect your stream. In particular, look for construction sites, parking lots, manicured lawns, farming, cattle crossings, mining, industrial and sewage treatment plant discharges, open dumps, and landfills. Look for the outfalls you identified in your background investigation. Also look for forested land, healthy riparian zones, undisturbed wetlands, wildlife, and the presence of recreational users of the stream such as swimmers or people fishing. (Note that heavy recreational use or large flocks of birds might adversely affect the quality of streams, ponds, lakes, and wetlands.)

Task 5 Walk the stream

Use your field data sheet to record your findings. Always be as specific as possible when noting your location and the water conditions you are observing. Draw new maps or take pictures if that will help you remember what you are observing. Don't be afraid to take too many notes or draw too many pictures. You can always sort through them later.

Take note of the positive conditions and activities you see as well as the negative ones. This, too, will help you characterize the stream and its watershed. Look for such things as people swimming or fishing in the stream; stable, naturally vegetated banks; fish and waterfowl; or other signs that the stream is healthy.

For more information on what to look for in and around the stream, consult Chapter 4 and, in particular, the Stream Habitat Walk.

Task 6 Review your maps/field data sheets

When reviewing your data, be sure maps are legible and properly identified, photos have identifiable references, and field data sheets are filled out completely and accurately. Your program coordinator might ask for your field data sheets, maps, and other material and can probably help interpret the findings of your watershed survey.

References and Further Reading

Ely, E. 1994. Delineating a Watershed. The Volunteer Monitor. 6(2):3.

Ely, E. 1994. LandUse Surveys. The Volunteer Monitor. 6(2):19.

Gordon, N.D., T.A. McMahon, et al. 1992. Stream Hydrology: An Introduction for Ecologists. John Wiley and Sons.

Kerr, M. and V. Lee. 1992. Volunteer Monitoring: Pipe Detectives Manual. March 1992. Rhode Island Sea Grant, University of Rhode Island, Coastal Resources Center.

Kerr, M. and V. Lee. 1992. Volunteer Monitoring: Shoreline Mapping Manual. March. Rhode Island Sea Grant, University of Rhode Island, Coastal Resources Center.

Maryland Save Our Streams. Watershed Survey, Stream Survey, and Construction Site Inventory (packets). Maryland Save Our Streams, 258 Scotts Manor Drive, Glen Burnie, MD 21061.

Trautmann, N. and E. Barnaba. 1994. Aerial Photographs A Useful Monitoring Tool. The Volunteer Monitor. 6(2):17.

University of Rhode Island. 1990. Rhode Island Watershed Watch: Shoreline Survey Manual for Lakes, Rivers, and Streams. Draft. June.

Yates, S. 1988. Adopting a Stream: A Northwest Handbook. Adopt-A-Stream Foundation. University of Washington Press.

Watershed Survey Visual Assessment (PDF, 15.0 KB)

Adobe Acrobat Reader is required to view PDF documents. The most recent version of the Adobe Acrobat Reader is available as a free download. An Adobe Acrobat plug-in for assisted technologies is also available.