Watershed Health
Basin intelligence on real USGS hydrologic units. Every asset is placed in its HUC8 sub-basin; each sub-basin carries the latest US Drought Monitor coverage and the streamflow percentiles of the USGS gauges inside it. Regions roll those up with asset quality and regulatory burden into a single 0–100 health index.
Regions
21
Sub-basins
2,456
2,253 with drought data
Assets placed
4,020,595
97% of active assets
In drought
599
sub-basins ≥50% area in D2+
Gauges below normal
2,057
of 7,530 reporting
Avg health
69
0 stressed / critical
Drought as of 2026-10-17Streamflow as of 2026-10-17
79Healthy
Ohio RegionHUC 05Abnormally dry DSCI 47
Quality
56
Drought
91
Flow
82
Regulatory
98
Coverage
80
281,781 assetsAvg WIS 56.3120 sub-basins2% area in D2+7,651 alerts
6% low
A: 5B: 162,099C: 119,677
78Healthy
Mid Atlantic RegionHUC 02Abnormally dry DSCI 35
Quality
52
Drought
93
Flow
88
Regulatory
98
Coverage
74
313,241 assetsAvg WIS 5288 sub-basins0% area in D2+11,074 alerts
4% low
A: 175B: 136,317C: 176,749
77Healthy
Alaska RegionHUC 19Abnormally dry DSCI 8
Quality
46
Drought
98
Flow
88
Regulatory
99
Coverage
66
111,996 assetsAvg WIS 45.8209 sub-basins0% area in D2+2,029 alerts
4% low
B: 6,452C: 105,544
74Moderate
Tennessee RegionHUC 06Moderate drought DSCI 143
Quality
56
Drought
71
Flow
81
Regulatory
97
Coverage
81
36,663 assetsAvg WIS 56.532 sub-basins22% area in D2+1,554 alerts
22% low
B: 22,440C: 14,223
73Moderate
Great Lakes RegionHUC 04Moderate drought DSCI 110
Quality
52
Drought
78
Flow
85
Regulatory
98
Coverage
67
224,613 assetsAvg WIS 51.6177 sub-basins19% area in D2+7,103 alerts
10% low
A: 1B: 75,939C: 148,673
72Moderate
South Atlantic-Gulf RegionHUC 03Moderate drought DSCI 123
Quality
55
Drought
75
Flow
73
Regulatory
98
Coverage
78
383,188 assetsAvg WIS 55.2203 sub-basins12% area in D2+11,498 alerts
28% low
A: 21B: 212,097C: 171,070
72Moderate
Upper Mississippi RegionHUC 07Moderate drought DSCI 105
Quality
51
Drought
79
Flow
80
Regulatory
99
Coverage
65
403,989 assetsAvg WIS 51.2131 sub-basins19% area in D2+7,454 alerts
11% low
A: 69B: 116,880C: 287,040
71Moderate
Souris-Red-Rainy RegionHUC 09Moderate drought DSCI 106
Quality
49
Drought
79
Flow
75
Regulatory
99
Coverage
68
64,779 assetsAvg WIS 49.454 sub-basins11% area in D2+1,108 alerts2 transfers
22% low
A: 8B: 21,256C: 43,515
71Moderate
Missouri RegionHUC 10Moderate drought DSCI 142
Quality
54
Drought
72
Flow
74
Regulatory
99
Coverage
77
561,830 assetsAvg WIS 54.1307 sub-basins25% area in D2+11,713 alerts112,405 transfers
26% low
A: 11,155B: 271,931C: 278,744
70Moderate
Hawaii RegionHUC 20Abnormally dry DSCI 9
Quality
43
Drought
98
Flow
79
Regulatory
79
Coverage
51
6,820 assetsAvg WIS 42.719 sub-basins0% area in D2+2,003 alerts
4% low
A: 1B: 145C: 6,674
69Moderate
New England RegionHUC 01Moderate drought DSCI 183
Quality
50
Drought
63
Flow
86
Regulatory
97
Coverage
64
273,884 assetsAvg WIS 50.459 sub-basins26% area in D2+10,674 alerts
9% low
B: 75,989C: 197,895
68Moderate
California RegionHUC 18Abnormally dry DSCI 96
Quality
52
Drought
81
Flow
64
Regulatory
81
Coverage
71
153,973 assetsAvg WIS 52.1126 sub-basins1% area in D2+42,802 alerts337 transfers
45% low
A: 102B: 63,052C: 90,819
67Moderate
Rio Grande RegionHUC 13Severe drought DSCI 201
Quality
54
Drought
60
Flow
68
Regulatory
98
Coverage
71
71,070 assetsAvg WIS 54.174 sub-basins33% area in D2+1,652 alerts25,351 transfers
32% low
A: 5B: 32,116C: 38,949
66Moderate
Lower Colorado RegionHUC 15Moderate drought DSCI 155
Quality
50
Drought
69
Flow
61
Regulatory
98
Coverage
70
134,833 assetsAvg WIS 50.585 sub-basins14% area in D2+3,039 alerts14 transfers
40% low
A: 4B: 48,325C: 86,504
66Moderate
Caribbean RegionHUC 21Moderate drought DSCI 147
Quality
58
Drought
71
Flow
40
Regulatory
100
Coverage
84
50 assetsAvg WIS 588 sub-basins29% area in D2+0 alerts
65% low
B: 34C: 16
65Moderate
Texas-Gulf RegionHUC 12Severe drought DSCI 244
Quality
54
Drought
51
Flow
67
Regulatory
99
Coverage
74
108,780 assetsAvg WIS 53.8122 sub-basins52% area in D2+2,107 alerts
40% low
A: 5B: 50,869C: 57,906
64Moderate
Arkansas-White-Red RegionHUC 11Severe drought DSCI 278
Quality
55
Drought
44
Flow
70
Regulatory
99
Coverage
78
300,049 assetsAvg WIS 55.3173 sub-basins64% area in D2+5,175 alerts39,073 transfers
32% low
A: 1,095B: 166,819C: 132,135
62Moderate
Upper Colorado RegionHUC 14Severe drought DSCI 280
Quality
54
Drought
44
Flow
63
Regulatory
99
Coverage
75
57,738 assetsAvg WIS 54.460 sub-basins62% area in D2+720 alerts138,064 transfers
33% low
A: 2B: 27,612C: 30,124
62Moderate
Great Basin RegionHUC 16Severe drought DSCI 269
Quality
52
Drought
46
Flow
64
Regulatory
97
Coverage
71
88,823 assetsAvg WIS 52.171 sub-basins61% area in D2+3,757 alerts17,107 transfers
45% low
A: 321B: 33,108C: 55,394
60Moderate
Pacific Northwest RegionHUC 17Severe drought DSCI 212
Quality
51
Drought
58
Flow
46
Regulatory
98
Coverage
70
264,359 assetsAvg WIS 50.7229 sub-basins41% area in D2+6,638 alerts11,753 transfers
64% low
S: 2A: 1,588B: 92,772C: 169,997
56Moderate
Lower Mississippi RegionHUC 08Severe drought DSCI 282
Quality
48
Drought
44
Flow
48
Regulatory
99
Coverage
61
178,136 assetsAvg WIS 47.982 sub-basins67% area in D2+3,562 alerts
60% low
A: 6B: 39,487C: 138,643
Region health = asset quality 30% (avg WIS) · drought 25% (100 − DSCI/5, area-weighted) · streamflow 20% (gauges classed against their day-of-year record; much-below counts 0, normal 100) · regulatory burden 15% · data coverage 10%. Signals we do not have for a region drop out and the rest renormalise.
Sub-basin health = quality 35% · drought 35% · streamflow 30%. Drought from the US Drought Monitor (weekly, by HUC8); streamflow from USGS NWIS instantaneous values placed against NWIS daily statistics (refreshed daily). Regulatory alerts and water-rights transfers are located by point-in-polygon too. Boundaries: USGS Watershed Boundary Dataset.