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The Ottawa Hills Dam Decommissioning Project. Constructed: August 2008

The Ottawa Hills Dam Decommissioning Project. Constructed: August 2008. At the request of the Village of Ottawa Hills we did not work in this bend even though the vertical bank is 7 ft tall and the water over 7 ft deep!!.

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The Ottawa Hills Dam Decommissioning Project. Constructed: August 2008

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  1. The Ottawa Hills Dam Decommissioning Project. Constructed: August 2008

  2. At the request of the Village of Ottawa Hills we did not work in this bend even though the vertical bank is 7 ft tall and the water over 7 ft deep!! This project will encompass the bends immediately upstream and downstream of the former dam site US Project Limit Existing riffle constructed by ODOT Conceptual Design Illustration of Restoration Site by Matt Horvat of TMACOG DS Project Limit

  3. The Ottawa Hills Dam Decommissioning ProjectThe dam was removed by Ohio-DOT in November 2007.The project described in this PowerPoint is designed to reduce bank erosion and protect public infrastructure (two roads), create aquatic & riparian habitat, improve streamside vegetation, assist with improving the riparian area, provide benches & stepping stones for public stream enjoyment and access, and still have the existing mowed floodplain recreation areas for public use!

  4. OHIO DOT REMOVING THE SECOR ROAD DAM NOV-DEC 2007

  5. Looking from left bank at the Secor Road dam. OTTAWA R-DAM REMOVAL @ OTTAWA HILLS-PIX BY MATT HORVAT-2007

  6. Typical condition US of the Secor Road dam. OTTAWA R-DAM REMOVAL @ OTTAWA HILLS-PIX BY MATT HORVAT-2007

  7. Looking from left bank @ trackhoe removing the dam. OTTAWA RIVER-DAM REMOVAL @ OTTAWA HILLS-PIX-LAWRENCE-2007

  8. Looking US @ trackhoes removing dam OTTAWA RIVER-DAM REMOVAL @ OTTAWA HILLS-PIX-LAWRENCE-2007

  9. Looking US. Dam out, right bank sheetpile out, concrete riffle in. Left bank sheetpile will stay. OTTAWA RIVER-DAM REMOVAL @ OTTAWA HILLS-PIX-HORVAT - 2007

  10. PRE-PROJECT PHOTOS STARTING FROM UPSTREAM TO DOWNSTREAMby Dave Derrick AUGUST 20, 2008

  11. Looking DS. High velocity current is eroding the right bank, then crosses over & erodes the left bank in the crossing. Note how deep Matt is. Matt went in over his head when he ventured near the right bank. At the request of the Village of Ottawa Hills, the right bank was not stabilized. PRE-PROJECT-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-20-2008

  12. Looking DS @ left eroded bank in the crossing & the upper portion of the US project bend. PRE-PROJECT-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-20-2008

  13. Looking US @ the lower end of the US project bend PRE-PROJECT-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-20-2008

  14. At the former dam site, looking US into the US bend PRE-PROJECT-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-20-2008

  15. Looking DS @ the DS project bend. Hill Ditch tributary comes in just US of the bend. PRE-PROJECT-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-20-2008

  16. Looking DS @ the DS project bend & the Secor Road bridge. PRE-PROJECT-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-20-2008

  17. Looking DS. The protection will tie into the existing bridge abutment protection right here. PRE-PROJECT-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-20-2008

  18. THE PLAN

  19. At the request of the Village of Ottawa Hills we did not work in this bend even though the vertical bank is 7 ft tall and the water over 7 ft deep!! This project will encompass the bends upstream and downstream of the former dam site US Project Limit Existing riffle constructed by ODOT Conceptual Design Illustration of Restoration Site by Matt Horvat of TMACOG DS Project Limit

  20. EQUIPMENT

  21. The Cat 330 tracked back hoe with a 4 ft wide bucket, 25 ft reach, weight about 70,000 pounds CONSTRUCTION-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-2008

  22. STONE & STONE STAGING

  23. SUITABLE STONEStone used for keys and LPSTP was a well-graded, self-adjusting, self-filtering Class A Stone with a size of 18” to 36” on the “B” axis. Stone for the Bendway Weirs & Traffic Control Stones was a specially produced armor stone that varied from 2’ by 2’ by 3’ to 4’ by 4’ by 5’.

  24. Dumping “A”stone-18 to 36 inch sized stone CONSTRUCTION-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-2008

  25. Staged “A”-stone and armor stone CONSTRUCTION-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-2008

  26. THE BEND IMMEDIATELY UPSTREAM OF THE FORMER DAM LOCATION

  27. Methodologies for the Upstream Bend • Traffic Control Stones with short Bendway Weirs • Vegetated keys • Transplanted clumps of shrubs • Hydraulic Cover Stones • Planned fall 2008: Container plantings of dogwoods, fast and slow growing shade trees, chokecherry, buttonbush, & other shrubs for food, pollinators, etc.

  28. A KEY HAS ONE MAIN JOB, TO CONNECT THE RIVER TRAINING STRUCTURE TO THE REST OF THE WORLD (DON’T LET THE STREAM GET BEHIND {FLANK} RIVER TRAINING STRUCTURES)

  29. CONSTRUCTION PHOTOSby Dave Derrick & Matt HorvatAugust 20-25, 2008

  30. Detail for key Flow Cross-section for keyway

  31. Looking uphill at the dug key trench Flow CONSTRUCTION-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-2008

  32. Detail for key Flow Place some stone & soil in the trench

  33. Placing some graded “A” stone and soil in the trench Flow CONSTRUCTION-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-2008

  34. Place Willow Poles against DS side of trench. Detail for key Flow

  35. Placing willow poles in the key trench CONSTRUCTION-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-2008

  36. Key will be extended uphill where the hoe is parked Flow CONSTRUCTION-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-2008

  37. Place the remainder of the stone in the trench Detail for key Flow

  38. Placing “A” stone within 1 ft of the surface of the trench CONSTRUCTION-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-2008

  39. Choke stone with soil & water in. Detail for key Flow

  40. Backfill with native soils. CONSTRUCTION-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-2008

  41. Backfill and overfill with native soils, then compact (some settling will still occur) Detail for key Flow

  42. Compacting soil over key. Note poles on DS side of key CONSTRUCTION-OTTAWA RIVER @ OTTAWA HILLS. PIX-DERRICK 8-2008

  43. TRAFFIC CONTROL STONES

  44. WHAT IS THE LOWER LIMIT OF HARD BANK PROTECTION?AND MORE IMPORTANT, HOW CAN WE REACH IT?

  45. TRAFFIC CONTROL STONES (TCS) WITH SINGLE-STONE OR SHORT BENDWAY WEIRS

  46. Traffic Control Stones for the US project bend Drawn by Matt Horvat, TMACOG

  47. Drawn by Matt Horvat, TMACOG

  48. Key Traffic Control Stones with Single Stone Bendway Weirs TCS TCS TCS Key TCS TCS SSBW TCS TCS TCS SSBW Key TCS SSBW Large stones (3 ft by 3 ft by 3 ft) designed to “kick” flow off the bank, must be keyed into the bed & bank, spaced 6 to 8 ft apart, every 3rd one should be keyed into the bank. Every 3rd stone has a Single Stone or short Bendway Weir.

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