Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know: What Policy Makers Need to Know (2015)

Chapter: Appendix F Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction

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Previous Chapter: Appendix E Illustrations of Delay and Possible Metrics by Major River System
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Suggested Citation: "Appendix F Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction." National Academies of Sciences, Engineering, and Medicine. 2015. Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know: What Policy Makers Need to Know. Washington, DC: The National Academies Press. doi: 10.17226/21763.
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APPENDIX F

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Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction

River System Average Age of Lock Installations (years) Correlation with Effective Age of Locks on a River System
Lockages Vessels Delayed (%) Tows Delayed (%) Average Vessel Delay Average Tow Delay Average Closure Duration Closure Frequency
All installations 61.04 0.2184 0.1404 -0.0750 0.1321 -0.1226 0.1691 0.2254
Ohio River 35.45 -0.0076 -0.0957 -0.0959 0.1081 0.0400 0.2407 -0.0477
Mississippi River 24.86 -0.3019 0.1758 -0.0103 -0.2738 -0.0463 0.6458 0.1295
Illinois River 22.28 -0.5754 0.0357 -0.2425 -0.3880 -0.2560 -0.6243 -0.5700
Columbia–Snake Rivers 44.88 -0.1953 0.1088 0.1566 0.0851 0.0677 0.8220 0.4676
Gulf Intracoastal Waterway 71.80 0.1603 0.1273 0.1050 -0.1422 -0.1403 0.2972 -0.1875
Arkansas River 45.33 0.4568 -0.7410 -0.7359 -0.7123 0.4552 -0.2562 -0.1563
Page 195 Bookmark
Suggested Citation: "Appendix F Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction." National Academies of Sciences, Engineering, and Medicine. 2015. Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know: What Policy Makers Need to Know. Washington, DC: The National Academies Press. doi: 10.17226/21763.
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Black Warrior, Tennessee, Tennessee–Tombigbee, Tombigbee 61.04 0.3474 0.5655 0.7040 0.3585 -0.1630 -0.1735 0.7485
Monongahela River 56.67 0.5545 0.7521 0.8632 0.5526 0.3800 Gaps in data 0.6358
Allegheny River 61.75 -0.0454 0.3048 -0.0426 0.1435 -0.1276 Gaps in data 0.0612

NOTE: High positive correlation (dark blue shading), greater than 75 percent correlation; high negative correlation (dark pink shading), less than -75 percent correlation; medium positive correlation (light blue shading), between 50 and 75 percent correlation; low correlation (white), within ±50 percent correlation. Some rivers indicate negative correlations with lock age because the correlations are affected by traffic level and rehabilitation; that is, some of the older locks have less traffic and so fewer traffic-related problems, or they may be rehabilitated and so experience fewer closures and delays.

SOURCE: U.S. Army Corps of Engineers Lock Use, Performance, and Characteristics, http://www.navigationdatacenter.us/lpms/lpms.htm, Locks by Waterway, Tons Locked by Commodity Group, Calendar Years 1993–2013; Locks by Waterway, Lock Usage, Calendar Years 1993–2013; and Locks by Waterway, Locks Unavailability, Calendar Years 1993–2013. Accessed July 2014.

Page 194 Bookmark
Suggested Citation: "Appendix F Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction." National Academies of Sciences, Engineering, and Medicine. 2015. Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know: What Policy Makers Need to Know. Washington, DC: The National Academies Press. doi: 10.17226/21763.
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Page 194
Page 195 Bookmark
Suggested Citation: "Appendix F Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction." National Academies of Sciences, Engineering, and Medicine. 2015. Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know: What Policy Makers Need to Know. Washington, DC: The National Academies Press. doi: 10.17226/21763.
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Next Chapter: Appendix G Energy Intensity Comparisons for Water, Rail, and Highway
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