High Plains Aquifer Water-Level Monitoring Study
Number of observation wells measured, 1980 and 1988 through 1999, and 2002

Number of observation wells measured, 1980 and 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