ANNUAL REPORT FOR 2006
Allen Creek Bridge Mitigation Site
Brunswick County
TIP No. B-3116
Prepared By:
Natural Environment Unit & Roadside Environmental Unit
North Carolina Department of Transportation
December 2006
TABLE OF CONTENTS
SUMMARY ...........................................................................................................1
1.0 Introduction ...............................................................................................2
.1 Project Description .........................................................................2
.2 Purpose .........................................................................................2
.3 Project History ................................................................................2
2.0 Vegetation: ................................................................................................4
.1 Success Criteria .............................................................................4
.2 Description of Species.....................................................................4
.3 Results of Vegetation Monitoring ....................................................4
.4 Conclusions. ...................................................................................4
3.0 Overall Conclusions and Recommendations .............................................4
FIGURES
Figure 1 – Site Location Map ...............................................................................3
APPENDICES
Appendix A – Site Photos .....................................................................................5
1
SUMMARY
The Allen Creek Bridge Mitigation Site is located in Brunswick County. The site
was planted in 2004 and was designed as wetland mitigation for impacts
associated with bridge project B-3116.
The mitigation encompasses approximately 0.24 acres total of wetland
restoration. The restoration effort involved re-vegetating the area that was
temporarily impacted due to the use of mechanized land clearing. The area that
was impacted by mechanized clearing is being monitored to ensure that it re-attains
wetland jurisdictional status. The restoration area was re-vegetated with
Spartina alterniflora. No hydrologic monitoring is required for this project;
however, vegetation monitoring is required for three years.
After the third year of monitoring, the Allen Creek Bridge site shows by visual
observation that the Spartina alterniflora in the wetland are surviving and that the
impacted area is re-attaining wetland jurisdictional status.
NCDOT proposes to discontinue vegetation monitoring of this site.
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1.0 INTRODUCTION
1.1 Project Description
The Allen Creek Bridge Mitigation site is located at Bridge No. 56 over Allen
Creek on NC 133 (Figure 1). The site consists of approximately 0.24 acres of
mitigation for wetland impacts associated with project B-3116.
1.2 Purpose
In order for a mitigation site to be considered successful, the site must meet
vegetation success criteria. This report details the vegetation monitoring in 2006
at the Allen Creek Bridge mitigation Site. Hydrologic monitoring was not required
for the site.
1.3 Project History
May 2004 Site planted
September 2004 Vegetation Monitoring (1 year)
July 2005 Vegetation Monitoring (2 year)
August 2006 Vegetation Monitoring (3 year)
3
2.0 VEGETATION: ALLEN CREEK BRIDGE MITIGATION SITE
(YEAR 3 MONITORING)
2.1 Success Criteria
Success Criteria states that the temporarily impacted area where mechanized
clearing occurred shall be replanted using Spartina alterniflora and the
temporarily impacted area must re-attain wetland jurisdictional status at the end
of three years.
2.2 Description of Species
The following wetland specie was planted in the Wetland Reforestation area:
Spartina alterniflora, Smooth Cordgrass
2.3 Results of Vegetation Monitoring
The impacted area where the mechanized clearing occurred and was re-vegetated
is re-attaining wetland jurisdictional status and the planted specie is
surviving.
Site Notes: Other species noted: big cordgrass, Juncus sp., and Scirpus sp.
2.4 Conclusions
There were approximately 0.24 acres total of wetland restoration on site. There
were no plots established on the site. By visual observation the Allen Creek
Bridge site shows that the planted specie is surviving and that the impacted area
is re-attaining wetland jurisdictional status.
3.0 Overall Conclusions and Recommendations
NCDOT proposes to discontinue vegetation monitoring at the Allen Creek Bridge
Site.
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5
APPENDIX A
SITE PHOTOS
Allen Creek Bridge
Photo 1 Photo 2
Photo 3 Photo 4
August 2006