Illinois Historical Events — Illinois River Watershed Intelligence

Every storm excursion above 1,000 cfs across the 23.5-year gauge record, with stage-time statistics and storm rainfall context from MRMS radar QPE.

Stage	Flow range (cfs)	% of time	Days/yr
Too Low	<150	9.8%	36
Low but Floatable	150–250	24.3%	89
Optimal	250–2500	62.5%	228
Above Recommended	>2500	3.3%	12

Date	Peak (cfs)	Duration >1000 (h)	Storm Rain (in)
2017-04-30	148,750	942	7.7
2022-05-05	99,025	537	7.0
2011-04-26	86,275	406	—
2015-12-27	83,000	507	8.0
2008-03-19	60,650	218	—
2019-10-06	55,025	298	4.3
2011-05-24	49,625	262	—
2004-04-24	47,225	274	—
2008-04-10	47,175	546	—
2021-04-28	46,100	356	4.8

Storm Excursion Catalog

350 excursions above 1,000 cfs (14.9/yr). Grouped by year, newest first. Rainfall from MRMS radar QPE (2014→present).

2026 — 11 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2026-06-22	5,365	156	450 → 5,365	1.9
2026-06-14	9,450	70	543 → 9,450	2.3
2026-06-08	14,875	68	317 → 14,875	3.2
2026-05-22	2,680	25	319 → 2,680	2.4
2026-05-19	1,615	6	318 → 1,615	1.0
2026-05-05	1,928	9	509 → 1,928	0.8
2026-04-24	7,878	156	294 → 7,878	1.9
2026-04-18	1,110	4	301 → 1,110	1.5
2026-04-04	5,305	32	220 → 5,305	2.2
2026-03-11	3,800	45	689 → 3,800	0.9
2026-03-05	6,768	103	205 → 6,768	2.4

2025 — 14 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2025-11-20	1,660	7	230 → 1,660	1.5
2025-09-24	17,167	137	265 → 17,167	4.1
2025-08-28	6,088	35	290 → 6,088	3.6
2025-08-01	1,942	12	371 → 1,942	1.5
2025-07-18	12,550	48	477 → 12,550	1.7
2025-07-12	1,727	8	411 → 1,727	1.9
2025-06-07	25,225	358	787 → 25,225	3.2
2025-06-04	1,770	28	787 → 1,770	1.0
2025-05-20	14,150	338	481 → 14,150	4.3
2025-05-01	6,718	206	940 → 6,718	2.3
2025-04-20	17,400	224	466 → 17,400	5.3
2025-04-05	25,325	155	216 → 25,325	4.4
2025-03-05	2,740	32	349 → 2,740	1.0
2025-02-13	1,110	6	253 → 1,110	0.8

2024 — 17 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2024-12-24	2,070	24	322 → 2,070	0.8
2024-12-16	1,138	2	205 → 1,138	1.3
2024-11-19	2,082	21	320 → 2,082	1.0
2024-11-09	4,572	43	629 → 4,572	1.1
2024-11-05	13,550	72	160 → 13,550	6.3
2024-07-05	1,422	10	204 → 1,422	1.8
2024-06-05	1,578	12	397 → 1,578	1.5
2024-06-01	1,310	4	384 → 1,310	0.6
2024-05-26	4,065	17	532 → 4,065	1.1
2024-05-23	1,182	7	441 → 1,182	1.2
2024-05-07	8,895	159	719 → 8,895	2.4
2024-04-29	4,275	105	248 → 4,275	3.1
2024-03-26	3,380	32	261 → 3,380	1.5
2024-02-04	1,858	32	456 → 1,858	1.4
2024-01-28	1,118	11	756 → 1,118	0.9
2024-01-26	1,050	8	472 → 1,050	1.2
2024-01-23	2,100	34	292 → 2,100	1.1

2023 — 20 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2023-12-25	3,562	30	246 → 3,562	1.6
2023-10-05	2,228	11	238 → 2,228	1.3
2023-09-24	4,628	21	335 → 4,628	3.3
2023-09-20	1,512	8	195 → 1,512	1.5
2023-08-13	5,095	47	253 → 5,095	2.1
2023-07-15	2,822	54	199 → 2,822	4.3
2023-06-14	2,445	15	317 → 2,445	1.5
2023-05-20	1,908	12	544 → 1,908	0.3
2023-05-13	2,127	71	385 → 2,127	1.9
2023-05-12	1,162	7	345 → 1,162	1.7
2023-04-05	1,060	3	762 → 1,060	0.5
2023-03-24	12,025	211	716 → 12,025	2.3
2023-03-17	1,680	33	867 → 1,680	0.5
2023-03-03	13,300	284	807 → 13,300	2.2
2023-02-27	1,655	58	676 → 1,655	0.8
2023-02-23	1,500	19	677 → 1,500	0.6
2023-02-16	2,875	102	846 → 2,875	1.3
2023-02-09	6,735	118	705 → 6,735	2.0
2023-01-18	4,490	33	330 → 4,490	0.9
2023-01-03	1,638	11	344 → 1,638	0.8

2022 — 23 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2022-12-14	5,338	208	316 → 5,338	2.5
2022-11-27	2,922	32	255 → 2,922	2.4
2022-11-24	2,318	18	215 → 2,318	1.4
2022-11-05	2,050	11	218 → 2,050	1.4
2022-10-25	2,242	23	165 → 2,242	2.8
2022-09-03	1,252	8	286 → 1,252	1.7
2022-08-30	2,400	10	266 → 2,400	0.7
2022-08-21	1,375	8	329 → 1,375	1.3
2022-08-17	1,717	10	257 → 1,717	1.6
2022-07-30	3,608	15	237 → 3,608	3.6
2022-06-08	5,985	93	547 → 5,985	2.6
2022-05-25	2,528	87	750 → 2,528	1.9
2022-05-22	1,118	12	753 → 1,118	0.8
2022-05-05	99,025	537	706 → 99,025	7.0
2022-04-13	14,725	233	591 → 14,725	2.6
2022-04-06	1,388	39	886 → 1,388	0.6
2022-03-30	6,927	101	568 → 6,927	1.4
2022-03-22	4,015	83	462 → 4,015	1.3
2022-03-18	1,078	4	404 → 1,078	0.5
2022-02-27	1,135	32	757 → 1,135	0.6
2022-02-22	2,765	43	729 → 2,765	0.6
2022-02-17	7,125	72	375 → 7,125	0.9
2022-01-01	3,620	52	486 → 3,620	1.4

2021 — 21 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2021-12-18	16,500	126	256 → 16,500	3.8
2021-10-28	2,860	48	267 → 2,860	2.5
2021-10-14	2,342	45	218 → 2,342	2.9
2021-09-21	1,090	2	208 → 1,090	1.2
2021-07-25	1,575	7	408 → 1,575	0.4
2021-07-18	4,792	57	305 → 4,792	4.0
2021-07-02	1,208	4	443 → 1,208	1.4
2021-06-21	1,510	8	430 → 1,510	1.2
2021-06-08	3,598	61	864 → 3,598	0.9
2021-05-28	8,445	254	835 → 8,445	2.2
2021-05-22	1,832	53	858 → 1,832	1.1
2021-05-17	1,435	19	697 → 1,435	0.7
2021-04-28	46,100	356	816 → 46,100	4.8
2021-04-24	4,318	65	439 → 4,318	1.4
2021-04-14	1,180	8	420 → 1,180	0.9
2021-03-26	3,582	87	629 → 3,582	1.2
2021-03-15	3,152	121	355 → 3,152	1.3
2021-01-31	1,020	5	827 → 1,020	0.4
2021-01-25	5,898	86	374 → 5,898	1.2
2021-01-07	1,570	57	788 → 1,570	0.8
2021-01-01	5,402	84	309 → 5,402	1.8

2020 — 11 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2020-11-25	1,138	9	458 → 1,138	0.6
2020-10-29	7,045	115	197 → 7,045	4.4
2020-07-22	3,210	10	300 → 3,210	1.1
2020-05-26	11,550	615	968 → 11,550	2.2
2020-05-08	2,752	79	922 → 2,752	1.1
2020-05-05	2,042	49	908 → 2,042	1.1
2020-04-29	2,910	235	910 → 2,910	1.6
2020-04-13	5,348	198	934 → 5,348	1.4
2020-03-19	30,750	653	612 → 30,750	2.3
2020-02-04	7,190	369	886 → 7,190	0.9
2020-01-11	17,825	533	549 → 17,825	2.8

2019 — 31 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2019-12-29	2,222	30	576 → 2,222	0.7
2019-12-17	1,078	10	726 → 1,078	0.4
2019-11-30	12,150	393	898 → 12,150	1.7
2019-11-07	17,225	623	964 → 17,225	3.3
2019-10-21	2,180	51	844 → 2,180	0.8
2019-10-06	55,025	298	393 → 55,025	4.3
2019-09-26	5,575	96	258 → 5,575	4.0
2019-08-27	1,105	5	535 → 1,105	1.0
2019-08-23	1,468	30	297 → 1,468	2.7
2019-08-09	2,495	14	379 → 2,495	1.4
2019-07-07	3,598	35	707 → 3,598	1.0
2019-06-23	24,850	172	824 → 24,850	3.5
2019-06-19	2,662	38	904 → 2,662	1.0
2019-06-17	1,110	43	917 → 1,110	1.2
2019-06-07	19,600	175	848 → 19,600	2.2
2019-05-30	5,540	148	760 → 5,540	2.1
2019-05-22	2,460	73	876 → 2,460	1.7
2019-05-19	1,472	28	876 → 1,472	0.8
2019-05-01	17,475	370	470 → 17,475	2.8
2019-04-26	1,138	7	498 → 1,138	0.9
2019-04-14	2,760	49	455 → 2,760	1.6
2019-03-30	3,948	33	570 → 3,948	0.8
2019-03-24	1,218	10	501 → 1,218	1.3
2019-03-12	2,432	62	880 → 2,432	1.3
2019-03-09	5,180	46	468 → 5,180	0.7
2019-02-20	1,100	12	730 → 1,100	0.4
2019-02-12	2,845	109	843 → 2,845	1.1
2019-02-07	3,480	47	558 → 3,480	1.3
2019-01-19	4,362	151	922 → 4,362	1.0
2019-01-12	4,465	150	816 → 4,465	1.8
2019-01-04	8,792	121	858 → 8,792	1.8

2018 — 14 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2018-12-31	3,425	49	729 → 3,425	0.8
2018-12-27	6,995	55	221 → 6,995	2.0
2018-12-01	3,738	21	191 → 3,738	1.4
2018-11-04	1,238	7	332 → 1,238	1.1
2018-09-22	1,168	4	161 → 1,168	1.8
2018-08-20	1,160	4	563 → 1,160	2.1
2018-08-17	4,018	27	296 → 4,018	2.2
2018-08-15	1,815	10	187 → 1,815	1.9
2018-07-31	1,620	7	183 → 1,620	2.0
2018-05-24	1,030	2	461 → 1,030	0.9
2018-05-17	1,790	14	506 → 1,790	1.8
2018-05-04	15,500	118	410 → 15,500	2.5
2018-03-27	17,650	216	331 → 17,650	3.4
2018-02-24	26,375	319	247 → 26,375	2.5

2017 — 11 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2017-10-22	1,955	13	164 → 1,955	1.9
2017-08-17	5,398	84	743 → 5,398	2.4
2017-08-13	2,062	41	286 → 2,062	1.4
2017-08-06	1,105	5	265 → 1,105	2.0
2017-07-05	1,190	10	469 → 1,190	1.6
2017-07-03	2,160	12	387 → 2,160	2.2
2017-06-18	2,162	15	527 → 2,162	1.5
2017-06-05	5,348	128	855 → 5,348	1.5
2017-06-01	1,155	30	899 → 1,155	0.3
2017-04-30	148,750	942	373 → 148,750	7.7
2017-03-25	5,228	105	224 → 5,228	1.8

2016 — 8 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2016-09-09	1,018	1	182 → 1,018	0.3
2016-07-25	1,160	2	244 → 1,160	0.7
2016-07-15	1,292	7	348 → 1,292	2.1
2016-07-09	3,855	20	241 → 3,855	2.1
2016-07-03	1,718	8	191 → 1,718	2.9
2016-05-25	5,448	60	280 → 5,448	2.0
2016-04-30	3,078	21	323 → 3,078	2.6
2016-03-09	5,240	64	363 → 5,240	1.5

2015 — 21 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2015-12-27	83,000	507	532 → 83,000	8.0
2015-12-14	13,450	85	167 → 13,450	2.6
2015-11-28	15,450	120	446 → 15,450	2.6
2015-11-18	11,825	48	234 → 11,825	4.0
2015-08-23	1,245	8	494 → 1,245	1.3
2015-08-19	2,662	15	245 → 2,662	2.5
2015-07-22	6,280	37	557 → 6,280	2.6
2015-07-08	15,925	160	590 → 15,925	2.6
2015-07-03	1,375	7	652 → 1,375	0.9
2015-06-27	8,858	55	801 → 8,858	0.9
2015-06-19	30,975	195	471 → 30,975	3.2
2015-05-25	18,800	248	703 → 18,800	2.5
2015-05-20	1,590	25	875 → 1,590	1.5
2015-05-17	4,978	52	708 → 4,978	0.9
2015-05-14	1,065	8	—	1.7
2015-04-18	1,040	3	490 → 1,040	0.6
2015-03-26	3,788	46	606 → 3,788	1.6
2015-03-19	1,192	15	882 → 1,192	0.3
2015-03-14	4,250	86	700 → 4,250	1.4
2015-03-10	1,152	12	594 → 1,152	0.7
2015-01-03	1,050	4	332 → 1,050	0.8

2014 — 9 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2014-12-18	1,298	16	359 → 1,298	1.6
2014-10-13	8,427	51	401 → 8,427	—
2014-10-10	6,065	25	146 → 6,065	—
2014-05-13	1,695	18	312 → 1,695	—
2014-04-07	1,440	15	643 → 1,440	—
2014-04-04	1,437	13	534 → 1,437	—
2014-03-29	1,435	11	506 → 1,435	—
2014-03-16	12,150	85	311 → 12,150	—
2014-01-11	2,328	39	355 → 2,328	—

2013 — 19 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2013-12-21	5,422	72	500 → 5,422	—
2013-12-14	1,422	19	231 → 1,422	—
2013-10-05	3,727	17	184 → 3,727	—
2013-09-20	1,565	7	164 → 1,565	—
2013-08-13	1,760	19	643 → 1,760	—
2013-08-08	17,350	51	317 → 17,350	—
2013-08-03	4,248	16	291 → 4,248	—
2013-07-31	2,165	8	199 → 2,165	—
2013-05-31	3,320	47	326 → 3,320	—
2013-05-22	10,633	65	633 → 10,633	—
2013-05-16	1,140	10	865 → 1,140	—
2013-05-10	25,500	109	525 → 25,500	—
2013-04-27	4,210	61	639 → 4,210	—
2013-04-18	23,175	91	425 → 23,175	—
2013-04-11	2,252	21	472 → 2,252	—
2013-04-03	1,308	18	725 → 1,308	—
2013-03-31	1,388	54	304 → 1,388	—
2013-03-10	5,710	50	188 → 5,710	—
2013-01-30	3,628	20	130 → 3,628	—

2012 — 4 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2012-08-27	1,045	1	112 → 1,045	—
2012-03-20	10,925	146	278 → 10,925	—
2012-02-04	3,400	28	414 → 3,400	—
2012-01-25	3,905	44	238 → 3,905	—

2011 — 14 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2011-12-20	1,432	20	632 → 1,432	—
2011-12-15	5,545	40	352 → 5,545	—
2011-11-22	4,572	35	322 → 4,572	—
2011-11-09	17,625	60	176 → 17,625	—
2011-09-22	1,210	8	200 → 1,210	—
2011-05-24	49,625	262	623 → 49,625	—
2011-05-13	1,540	15	769 → 1,540	—
2011-04-26	86,275	406	307 → 86,275	—
2011-04-15	1,065	3	405 → 1,065	—
2011-04-11	1,240	10	211 → 1,240	—
2011-03-14	1,238	14	357 → 1,238	—
2011-03-05	1,072	5	549 → 1,072	—
2011-02-28	3,735	27	530 → 3,735	—
2011-02-25	1,052	4	379 → 1,052	—

2010 — 15 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2010-11-26	1,082	5	133 → 1,082	—
2010-09-15	1,215	8	382 → 1,215	—
2010-09-09	3,645	26	203 → 3,645	—
2010-09-02	1,302	4	134 → 1,302	—
2010-07-27	1,598	8	502 → 1,598	—
2010-07-13	15,975	159	257 → 15,975	—
2010-07-10	1,222	3	182 → 1,222	—
2010-05-26	5,532	34	670 → 5,532	—
2010-05-20	5,175	76	817 → 5,175	—
2010-05-14	5,525	105	354 → 5,525	—
2010-04-25	1,178	9	364 → 1,178	—
2010-04-03	1,665	44	770 → 1,665	—
2010-03-26	6,078	228	370 → 6,078	—
2010-02-05	2,068	170	692 → 2,068	—
2010-01-21	1,708	20	251 → 1,708	—

2009 — 16 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2009-10-30	12,850	185	656 → 12,850	—
2009-10-09	33,200	210	230 → 33,200	—
2009-09-22	5,812	43	258 → 5,812	—
2009-06-17	1,672	15	692 → 1,672	—
2009-06-14	1,712	23	466 → 1,712	—
2009-06-13	1,825	14	343 → 1,825	—
2009-06-10	1,495	7	343 → 1,495	—
2009-05-24	1,090	4	710 → 1,090	—
2009-05-03	10,900	432	597 → 10,900	—
2009-04-19	5,590	117	868 → 5,590	—
2009-04-13	8,330	115	542 → 8,330	—
2009-03-29	2,625	161	936 → 2,625	—
2009-03-25	3,872	62	459 → 3,872	—
2009-03-22	1,138	6	227 → 1,138	—
2009-02-11	6,185	100	526 → 6,185	—
2009-01-28	3,980	152	173 → 3,980	—

2008 — 25 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2008-12-28	2,480	20	206 → 2,480	—
2008-10-07	1,572	9	308 → 1,572	—
2008-09-14	16,433	84	525 → 16,433	—
2008-09-04	6,735	94	248 → 6,735	—
2008-08-24	1,092	1	319 → 1,092	—
2008-08-10	4,482	40	270 → 4,482	—
2008-08-07	1,545	7	265 → 1,545	—
2008-07-24	1,198	4	486 → 1,198	—
2008-07-13	6,508	176	461 → 6,508	—
2008-07-06	2,295	14	368 → 2,295	—
2008-07-04	2,958	17	368 → 2,958	—
2008-06-29	1,125	6	387 → 1,125	—
2008-06-16	1,580	20	602 → 1,580	—
2008-06-14	1,028	2	652 → 1,028	—
2008-06-10	2,298	39	497 → 2,298	—
2008-06-02	4,380	55	533 → 4,380	—
2008-05-27	1,768	47	425 → 1,768	—
2008-05-15	1,342	11	571 → 1,342	—
2008-05-11	1,070	2	656 → 1,070	—
2008-05-02	1,075	10	905 → 1,075	—
2008-04-24	13,075	191	927 → 13,075	—
2008-04-10	47,175	546	876 → 47,175	—
2008-03-19	60,650	218	492 → 60,650	—
2008-03-03	9,428	115	523 → 9,428	—
2008-02-17	13,275	157	364 → 13,275	—

2007 — 9 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2007-10-03	2,840	18	111 → 2,840	—
2007-09-09	2,080	26	225 → 2,080	—
2007-08-25	1,802	9	95 → 1,802	—
2007-07-13	1,255	10	372 → 1,255	—
2007-07-06	1,582	17	652 → 1,582	—
2007-07-03	2,005	32	370 → 2,005	—
2007-04-25	1,215	7	253 → 1,215	—
2007-02-13	3,510	71	377 → 3,510	—
2007-01-14	12,200	66	393 → 12,200	—

2006 — 10 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2006-12-30	3,362	61	352 → 3,362	—
2006-11-30	16,333	119	189 → 16,333	—
2006-11-16	1,792	22	163 → 1,792	—
2006-09-23	8,402	53	292 → 8,402	—
2006-09-18	3,822	35	88 → 3,822	—
2006-08-23	4,085	21	49 → 4,085	—
2006-08-22	2,162	8	49 → 2,162	—
2006-05-10	1,650	19	444 → 1,650	—
2006-05-05	3,735	36	374 → 3,735	—
2006-04-29	2,112	22	182 → 2,112	—

2005 — 4 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2005-05-23	1,020	1	226 → 1,020	—
2005-04-11	4,130	53	638 → 4,130	—
2005-04-07	1,812	45	494 → 1,812	—
2005-01-05	14,175	362	242 → 14,175	—

2004 — 13 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2004-12-07	3,962	60	499 → 3,962	—
2004-12-01	1,168	32	526 → 1,168	—
2004-11-27	1,125	12	351 → 1,125	—
2004-11-24	1,070	5	319 → 1,070	—
2004-11-11	1,090	4	313 → 1,090	—
2004-11-01	7,462	43	196 → 7,462	—
2004-07-30	1,632	32	377 → 1,632	—
2004-07-25	3,218	24	229 → 3,218	—
2004-07-03	20,700	79	224 → 20,700	—
2004-05-14	1,970	17	420 → 1,970	—
2004-04-24	47,225	274	257 → 47,225	—
2004-03-29	1,258	6	296 → 1,258	—
2004-03-05	3,735	85	205 → 3,735	—

2003 — 9 events

Date	Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2003-12-23	1,172	2	223 → 1,172	—
2003-11-18	3,458	27	142 → 3,458	—
2003-06-11	1,422	9	242 → 1,422	—
2003-06-02	1,975	12	248 → 1,975	—
2003-05-20	3,972	29	643 → 3,972	—
2003-05-16	4,420	49	193 → 4,420	—
2003-05-14	2,600	17	165 → 2,600	—
2003-03-19	1,198	7	240 → 1,198	—
2003-02-22	1,398	11	222 → 1,398	—

2002 — 1 event

Date		Peak (cfs)	Duration >1000 (h)	Baseline → Rise	Storm Rain (in)
2002-12-31		2,590	21	368 → 2,590	—

Illinois River (Hwy 16) — Historical Event Reporting

Illinois River at Hwy 16 near Siloam Springs · USGS 07195400

Time in Each Stage

Biggest Floods on Record

Storm Excursion Catalog