Illinois River Intelligence

Upper Illinois Water Trail

Data age: 2 min

Illinois River at Hwy 16 near Siloam Springs
319 cfs
Optimal
6.32 ft
➡ +0 cfs/hr
as of 9:00 AM CT
Too Low: < 150 cfs
Low but Floatable: 150–250 cfs
Optimal: 250–2,500 cfs
Above Recommended: > 2,500 cfs
Recommendations are from Local Paddling Community.
The AGFC officially recommends 200–1,000 cfs for the Upper Illinois Water Trail.

Hwy 16 Gauge - Past 24 hours

peak 346
24h ago12hnow
Range over 24 h: 319–346 cfs

Upstream Signal Gauges

Illinois River at Savoy
32.2 cfs ➡
signals Hwy 16 · ~6–8 h lead
as of 9:00 AM CT
Osage Creek at Elm Springs
112.0 cfs ⬇
signals Hwy 16 · ~7–10 h lead
as of 9:00 AM CT
Osage Creek at Cave Springs
30.0 cfs ➡
signals Hwy 16 · ~9–13 h lead
as of 8:45 AM CT
Mud Creek at Johnson
7.4 cfs ➡
signals Hwy 16 · ~11–16 h lead
as of 7:25 AM CT

Above Hwy 16 Watershed Rainfall

Sub-Watershed1 hr24 hr24 hr QPF
Lake Weddington-Illinois River0.00"0.10"0.00"
Headwaters Illinois River0.00"0.10"0.00"
Goose Creek-Illinois River0.00"0.17"0.00"
Mud Creek0.00"0.20"0.00"
Hamestring Creek0.00"0.13"0.00"
Little Wildcat Creek-Clear Creek0.00"0.08"0.00"
Headwaters Osage Creek0.00"0.07"0.00"
Little Osage Creek0.00"0.09"0.00"
Brush Creek0.00"0.06"0.00"
Outlet Osage Creek0.00"0.10"0.00"
Upper Muddy Fork0.00"0.14"0.00"
Moores Creek0.00"0.09"0.00"
Lower Muddy Fork0.00"0.09"0.00"
Chambers Hollow-Illinois River0.00"0.12"0.00"
Lake Fayetteville-Clear Creek0.00"0.13"0.00"
Spring Creek0.00"0.06"0.00"
Zone 24 hr QPF total: 0.00"
Illinois River near Watts, OK (Downstream of WOKA)
332 cfs
Low but Floatable
2.66 ft
⬇ -12 cfs/hr
as of 8:30 AM CT
Too Low: < 200 cfs
Low but Floatable: 200–400 cfs
Optimal: 400–2,500 cfs
Above Recommended: > 2,500 cfs

Watts, OK Gauge - Past 24 hours

peak 388
24h ago12hnow
Range over 24 h: 332–388 cfs

Below Hwy 16 Watershed Rainfall

Sub-Watershed1 hr24 hr24 hr QPF
Upper Ballard Creek0.00"0.09"0.00"
Lake Frances-Illinois River0.00"0.14"0.00"
Weddington Creek0.00"0.08"0.00"
Cincinnati Creek0.00"0.09"0.00"
Lower Ballad Creek0.00"0.12"0.00"
Zone 24 hr QPF total: 0.00"

Watershed Rainfall Map

QPE = Precipitation Estimate (observed) · QPF = Precipitation Forecast

0"
0.01–0.24"
0.25–0.49"
0.50–0.99"
1.00–1.99"
2.00"+

📊 Empirical Forecast

No rise indicated by recent rainfall

Soil: MOIST · Confidence: CALIBRATED

Forecast applies to the Hwy 16 decision-gauge thresholds.

Details

Calibrated chance the gauge rises from MEDIUM to HIGH within the next 30 h, from 24 h rainfall (2.7 mm) at this gauge level (history stratum gq1); ground MOIST by 7-day rain. Experimental.

LevelChanceRain before past rises
24 h total · p25 / p50 / p75
n
LOW 150 cfs—fewer than 10 past rises on record
MEDIUM 250 cfs—0.51"0.97"1.63"29
moist soil
HIGH 2,500 cfs~2%0.90"1.42"1.93"140
moist soil

Rain columns are context, not a probability: the 24-h rain that fell before past rises to each level (quartiles of n past rises; the population is noted under n). This basin: 0.11" so far in the last 24 h. The Chance column is the calibrated forecast.

📖 Historical Events & Stage Time →

3-Day Forecast

Updated: 6:49 AM CT

Siloam Springs
Today
57° / 38°
Mostly Sunny
N 15 to 20 mph
Saturday
61° / 37°
Sunny
NE 5 mph
Sunday
65° / 42°
Patchy Frost then Sunny
S 0 to 5 mph
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DISCLAIMER: This site provides creek condition estimates for informational purposes only. Gauge data, radar estimates, and forecasts may be delayed, inaccurate, or unavailable. Always exercise independent judgment. Whitewater kayaking is inherently dangerous — water conditions can change rapidly. This site and its maintainers assume no responsibility for decisions made based on information displayed here.