VDOT presentation from Fairfax County's Pikes Branch project meeting on October 11, 2018.

2. VDOT PIKES BRANCH STREAM RESTORATION
Tracey Harmon, Joe Parfitt
Fairfax County, Virginia
October 11th, 2018

3. Project Location
Virginia Department of Transportation 3
Ridgeview Park restoration project
Future County
restoration project
PROJECT LOCATION

4. Aerial Photo
Virginia Department of Transportation 4
PROJECT LOCATION

5. Project Purpose
• Move stream away from eroding valley walls adjacent to both roadways
• Provide functional uplift to Pikes Branch
• Achieve pollutant reduction requirements of the Chesapeake Bay TMDL
Project Need
• Reduce the erosion and mass wasting of the stream banks
• Connect channel to active floodplain
• Remove fish passage blockages (Aquatic Organism Passage)
• Reduce sediment and nutrient loadings to the Potomac River & Ches Bay
• Manage stormwater runoff from 16 outfalls
• Remove invasive plant species and provide stream buffer restoration
Purpose and Need
Virginia Department of Transportation 5

6. Existing Conditions
Virginia Department of Transportation
The existing channel is in poor condition
with multiple fish barriers, severely
eroding banks, 16 stormwater outfalls,
and exposed sanitary sewer crossings.
Outfalls
6
Phase I
Phase II
ROAD
ENCROACHMENT
STREAM ENCROACHING
INTO ROAD

7. Virginia Department of Transportation 7
Stream Encroaching
into Road

8. Eroding Banks
Virginia Department of Transportation 8

9. Virginia Department of Transportation 9
Eroding Banks

10. Virginia Department of Transportation 10
Eroding Banks

11. Virginia Department of Transportation 11
Eroding Banks

12. Virginia Department of Transportation 12
Fish Passage
Blockages

13. 13Virginia Department of Transportation
Failed Bank
Stabilization

14. Virginia Department of Transportation 14
Failed Stormwater
Outfalls

15. 15Virginia Department of Transportation
Debris in Stream

16. Total Nitrogen (lbs/yr)
Total Phosphorus
(lbs/yr)
Totals Suspended
Sediment (lbs/yr)
2000 900 105,000
16
Chesapeake Bay Nutrient & Sediment Estimated
Reductions
Virginia Department of Transportation

17. Vegetation assessment survey conducted
Native Woody Species
Approx. 65 trees are ≥ 24 inches in diameter.
17
Existing Vegetation Assessment
Virginia Department of Transportation
American beech Yellow poplar
White oak Northern red oak
Black locust Witch hazel
American holly Eastern red cedar
Smooth sumac

18. Invasive (non-native) species are prevalent throughout the project area
18
Existing Vegetation Assessment
Virginia Department of Transportation
Tree of Heaven Mimosa
Norway maple Japanese honeysuckle
Callery pear White mulberry
Garlic mustard Kudzu
Porcelain berry Japanese knotweed
Original bittersweet Multiflora rose
English ivy Crown vetch
Chinese wisteria Periwinkle

19. 19Virginia Department of Transportation
Example VDOT Stream Project Before Restoration
Timsbury Creek, Chesterfield, VA

20. 20Virginia Department of Transportation
Example VDOT Stream Project 2018 3 Months After Restoration
Timsbury Creek, Chesterfield, VA

21. 21Virginia Department of Transportation
Example VDOT Stream Project 2 Years After Restoration
Unnamed tributary to Long Branch, Fredericksburg,VA

22. 22Virginia Department of Transportation
RES Urban Stream Project Before Restoration
Cow Branch Stream Restoration, Prince William County, VA

23. 23Virginia Department of Transportation
RES Urban Stream Project After Restoration
Cow Branch Stream Restoration, Prince William County, VA

24. 24Virginia Department of Transportation
RES Urban Stream Project 4 Years after Restoration
Cow Branch

25. RES Urban Stream Project 4 Years after Restoration
25Virginia Department of Transportation
• Growth after 4 years of
Construction
Aster/ Coreopsis New England Aster
GoldenrodBlack Willow Swamp White Oak Sedge species
Blue mist Flower
Cow Branch

26. • Remove debris, concrete, rip rap, etc.
• Remove invasive plant species
• Stabilize numerous stormwater outfalls
• Restore fish passage
• Reconnect the floodplain
• Improve channel alignment
• Provide bank stability
• Reduce nutrient and sediment loading
Pike Branch Stream Restoration Project Description
Virginia Department of Transportation 26

27. 27Virginia Department of Transportation
Existing vs. Proposed
Existing Stream
Channel
Proposed Stream
Channel
Floodplain

28. Native species will be planted.
Streambanks
• 500-600 bare root seedling trees (smooth alder)
• Planted on 2 foot centers
• 1600-1700 live stakes
• silky dogwood, buttonbush, black willow, sycamore
Upland planting - approx. 3.5 acres
• 600 bare root seedlings per acre
• Trees (American beech, red maple, tulip poplar, chestnut oak, white oak, Northern red
oak)
• Shrubs (Eastern redbud, ironwood, American witch hazel)
28
Proposed Planting Palette
Virginia Department of Transportation

29. 29
Virginia Department of Transportation
Proposed Conditions
CROSS SECTION 2

30. Virginia Department of Transportation 30
40’ wide Floodplain

31. Final Design Plans in Nov. 2018
Pardon Our Dust Meeting in Dec. 2018 or Jan. 2019
Start Construction in Early 2019
Project Duration = 12-18 months
31
Schedule
Virginia Department of Transportation

32. 32
Old Telegraph Road Embankment Failure
Virginia Department of Transportation
June 25th
July 23rd Aug. 1st

33. 33Virginia Department of Transportation
Emergency
Project
Old Telegraph Road
• Drilled Shafts
• Temporary Stream
Relocation
• Embankment Slope
Stabilization

34. 34
Questions?
Virginia Department of Transportation