TABLE 2.1 Estimated Lengths of Major U.S. Underground Utility Services

Transmission (miles) Distribution/Collection (miles) Service (miles) Total (miles)
Gas
  Gathering …………………….41,000
(DOE, 2006)
  Interstate ……………………250,000
  Intrastate ……………………..75,000
1,212,688 (PHMSA, 2005) 780,392 (PHMSA, 2005)a 2,359,080
Hazardous Liquid………….160,868 (PHMSA, 2003) 160,868
Oil
  Gathering ……………………35,000 (Pipeline 101, 2001)
  Crude…………………………..65,942 (BTS, 2004)
  Product ……………………….76,258
177,200
Water ………………………….660,000 (Brongers, 2002) 995,644 (EPA, 2007) 854,364 (EPA 2007)b 2,510,008
Sewer
  Public
  Private
724,000 (EPA, 2006) 500,000 1,224,000
Electric ……………………….167,643 (NERC, 2006) 600,000c 400,000d 1,167,643
Telecom
Underground Cable
  Metallic
  Fiber
Buried Cable
  Metallic
  Fiber
Conduit System
  Trench
382,472 (FCC, 2006)
217,266

2,178,320
217,322

199,541
3,194,921
Grand Total 10,793,719

aThe total number of gas services in the United States, according to PHMSA (2005), is 63,523,945. This number was then converted to miles by taking an average length of one service line to be 65 ft.

bThe total number of water services in the United States, according to EPA (2007), is about 69,545,307. This number was then converted to miles by taking an average length of one service line to be 65 ft.

cEleven U.S. utilities reported a total of 296,093 miles (Sterling et al., 2009). However, the length of underground electrical distribution is expected to be much less than for gas or water, which are fully underground. A figure of 600,000 miles is assumed as the U.S. total.

dThis figure is a rough estimate based on underground electric service being less than half the length of underground water services.

SOURCE: Adapted from Sterling et al., 2009.



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