| 11. | Construction of the riprap foundation began in April 1871.
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| 12. | The whole structure is surrounded and protected by riprap.
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| 13. | Portions of the shore have been stabilized with riprap to deter further erosion.
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| 14. | The creek has low banks, which have riprap on them in places.
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| 15. | Several grouted riprap structures were also constructed between and downstream of these drops.
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| 16. | In the 1920s, 50 percent of the shoreline was lined with riprap.
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| 17. | Protective riprap and breakwater sheltering light s boat basin.
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| 18. | This riprap is in a layer that is thick.
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| 19. | Fall Brook flows through an artificial channel lined with riprap in some reaches.
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| 20. | Riprap dikes along the island's perimeter are so weak they need reinforcement.
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