Slide 6 shows the cumulative loss of these long-term streamgages shown in Slide 5. The graph shows a fairly stable rate of loss through time of nearly 78 streamgages per year and that from 1980 to 2004 2,051 streamgages with 30 or more years of streamflow record were discontinued.
| Years | Lost Long-Term Streamgages | Cumulative Lost Streamgages |
|---|---|---|
| 1980 | 87 | 87 |
| 1981 | 78 | 165 |
| 1982 | 134 | 299 |
| 1983 | 128 | 427 |
| 1984 | 97 | 524 |
| 1985 | 51 | 575 |
| 1986 | 56 | 631 |
| 1987 | 85 | 716 |
| 1988 | 57 | 773 |
| 1989 | 29 | 802 |
| 1990 | 76 | 878 |
| 1991 | 83 | 961 |
| 1992 | 146 | 1107 |
| 1993 | 72 | 1179 |
| 1994 | 98 | 1277 |
| 1995 | 152 | 1429 |
| 1996 | 102 | 1531 |
| 1997 | 87 | 1618 |
| 1998 | 56 | 1674 |
| 1999 | 62 | 1736 |
| 2000 | 53 | 1789 |
| 2001 | 27 | 1816 |
| 2002 | 57 | 1873 |
| 2003 | 56 | 1929 |
| 2004 | 122 | 2051 |