Riparian Corridor Restoration:
Oak Mitigation in The American River Parkway




Author Information

Wendy Toffoletti
American River College
Geography 350: Data Acquisition in GIS
Fall 2011
7016 Woodknoll Way, Carmichael, CA 95608
rwtoffoletti@sbcglobal.net


Abstract

Riparian corridor restoration projects are occuring all along the American River. Many non-profit orgainizations recruit hundreds of volunteers
each year to help restore, protect, and preserve this unique ecosystem. One project in particular is known as the Oak Mitigation Project.
In an effort to evaluate the success of this project field surveys were conducted, data stored in ArcMap and a georelational model was produced.
The results have been relatively inclusive but considered valuable and beneficial for future analysis.


Introduction

The American River is one of the best rivers in the nation. It originates in the Sierra Nevada mountain range and empties into the Sacramento River.
Here in Sacramento, the American River is buffeted by a 23-mile riparian corridor known as the American River Parkway.

The American River Parkway Foundation (ARPF) is one of many non-profit organizations dedicated to protecting this local treasure.
Among other conservation efforts, the ARPF has championed the Oak Mitigation Project,
a project designed to restore the riparian buffer zone hugging the banks of the American River.

The objective of this project is to gather both qualitative and quantitative spatial data to analyze the success of their restoration efforts.


Background

In the Spring of 2009, I chaperoned my daughter's 6th grade science field trip to Rossmoor Bar, a section of the American River Parkway
located in the Sacramento suburb of Rancho Cordova. I worked along side twenty-eight 6th graders as we dug holes, formed burms, cut and assembled
fencing for cages, and planted and caged acorns for hours. It was science at its best, hands-on and dirty. We felt proud to be an integral part in
helping the ARPF meet their goal of planting 1200 new oak trees along the American River Parkway. By the end of the day we had prepared and planted for
73 trees. It didn't take much to convince my family that we could do more to help so we volunteered to adopt the site we had helped start. Our site is
known as Elmanto Grove. It is just one of many groves being monitored and restored by ARPF volunteers. This particular site was chosen because it
had existing water access and it needed canopy.

In the early days of Sacramento history, when goldminers and farmers were first settling the area, Rossmoor Bar was very popular.
Livestock grazing, timber harvesting, and urban sprawl played a devasting role in destroying much of its riparian buffer zone. Fortunately,
in 1960, Sacramento County began to acquire land and formalized this area as a regional park and the American River Parkway was born.
However, it wasn't until 2007 that ARPF began its Oak Mitigation Project.

The Oak Mitigation Project has a two-fold purpose: to restore the riparian corridor to its pre-settlement condition and to enhance the quality of
this unique ecosystem. As volunteers, we have spent hundreds of hours over the last 3 years caring for our grove. It has been very labor intensive.
Maneuvering a 200 foot hose around 3 ft high medal cages and thousands of star thistle plants is much harder than it sounds. And at times our work has
been heartbeaking. For example, last year, a group of young teenagers started a fire in our grove and we lost at least half of our trees. But more commonly
it is the predators living amongst our trees that cause us the most anxiety. Young oak trees are no match for deer nibbiling on their leaves or California
voles sawing their roots in half. In fact, the grove seems precariously close to failing all the time. So I cannot help but wonder if all of our hardwork
is worth it. Are we making a difference when each year we seem to be starting from scratch again? I think GIS can help answer this question.


Methods

A dataset of existing mitigation sites in the American River Parkway was acquired from the County of Sacramento Regional Parks Department. Using ArcMap
this dataset was projected and given a topographic basemap. The map produced is excellent for location reference and highlighting Elmanto Grove along the Parkway.
Multiple field surveys were conducted and qualitative and quantitaive data was collected. Using the Garmin GPSmap76S waypoints for each tree in the Elmanto Grove
were recorded. The species class, cage type and height of each tree was also recorded. Then using ArcMap these waypoints were projected and given an aerial basemap.
In addition, an attribute table containing the recorded qualitative and quantitative data was created and linked to this new map layer.


Results

The following table is a sample of the data recorded during the field surveys. Species identification was done visually and confirmed by two people.
Height was measured using a 12' tape measure. And all cage types were recorded.


Waypoint ID Valley Oak Interior Live Oak Deer Cone Vole Height (in.)
9 X X 54
15 X X X 49
32 X X X 82
37 X X 67
40 X X X 52
57 X X 84
69 X
73 X X X 23

Figures and Maps

Kenya Precipitation
Valley Oak
Kenya Malaria Outbreaks
Valley Oak Leaves
Kenya Precipitation
Interior Live Oak
Kenya Malaria Outbreaks
Interior Live Oak Leaves
Kenya Precipitation
Mitigation Sites in the American River Parkway
Kenya Malaria Outbreaks
Elmanto Grove Higlighted
Kenya Precipitation
Marked Waypoints of Trees in Elmanto Grove
Kenya Malaria Outbreaks
Georelational Model: Elmanto Grove with Corresponding Attribute Table

Analysis

Field survey data was easily obtained using the Garmin 76S. However, due to lack of experience, multiple trips to the grove were needed to obtain more relevant data.
Manipulating the data in ArcMap was also restricted due to my limited knowledge and experience with this software. The final georelational model is good but incomplete.
More comprehensive data is needed. As I progressed in my research I discovered many variables that can potentially influence tree growth and health that were not
observed nor recorded. This missing data coupled with the fact that I only obtained one height measurement makes it difficult to qualitatively measure the success of
Elmanto Grove. However, I do think the qualitative and quantitative data recorded will be extremely valuable for future analysis.


Conclusion

The qualitative and quantitative data recorded and given spatial reference will be very valuable for future analysis. The continued monitoring of Elmanto Gove will
create opportunities to see correlations between species, cage type, invasive weed populations, oak predator activity, annual precipitation levels and tree health.
Visual examination of Elmanto Grove alone has been encouraging. However, good data formally recorded is more useful and conclusive. Sufficient data is necessary
to making good predictions and decisions about current and future mitigation efforts. The ARPF had recorded information about Elmanto Grove from its inception but the
fire in 2010 made all that information obsolete. And since this is the first season of recordings since the fire the data is insufficient for making any kind of comparison.
Fortunately, predictions and observations can still be made and tested. And now there is a formal place to record future findings. Today, Elmanto Grove is alive and thriving.
Honest efforts are being made all along the American River Parkway to restore its riparian corridor. Implementing GIS into these efforts will produce positive results and
positively influence future decisions regarding this local treasure. And I can think of twenty-eight 6th graders who would love to get their hands dirty again.


References

American River Parkway Foundation www.arpf.org

County of Sacramento: Regional Parks www.msa2.saccounty.net/parks

Maret, Mary. Senior Natural Resource Specialist. Sacramento County Department of Regional parks.
"GIS Data Files." Message to author. 11 October 2011. e-mail.

Myatt, Ken. American River Parkway Foundation Program Coordinator. Personal interview.