High Plains Aquifer Water-Level Monitoring Study
Number of observation wells measured for water-level comparison periods 1980 to 1988 through 1999, and 2002

Number of observation wells measured for water-level comparison periods 1980 to 1988 through 1999, and 2002

Time perioda	State
	Colorado	Kansas	Nebraska	New Mexico	Oklahoma	South Dakota	Texas	Wyoming	High Plains
1980-88 ()	--	--	--	--	--	--	--	--	4,719
1980-89 ()	521	975	2,611	216	303	52	243	24	4,945
1980-90 ()	565	1,136	2,615	214	320	59	2,153	23	7,085
1980-91 ()	572	1,186	2,332	244	233	60	2,339	18	6,984
1980-92 ()	560	1,077	2,167	215	226	38	2,288	24	6,595
1980-93 ()	541	1,043	2,127	200	195	38	2,033	29	6,206
1980-94 ()	550	1,088	2,056	172	207	35	2,012	23	6,143
1980-95 ()	519	965	2,000	186	198	38	1,974	21	5,901
1980-96 ()	495	809	1,892	159	193	37	1,825	19	5,429
1980-97 ()	502	755	1,937	168	171	70	1,617	13	5,233
1980-98 ()	491	758	1,816	88	163	73	1,561	14	4,964
1980-99 ()	485	740	1,830	18	135	72	1,524	14	4,818
1980-02b ()	460	764	1,697	169c	150	73	1,417	16	4,746

^aClick on year to view reference.
^bStatistics were not computed for 1980 to 2000 and 1980 to 2001
^c Includes wells measured in 1998 to 2001 because many wells in New Mexico are measured on a 5-year schedule