DeWitt, IL, United States · Saturday, March 27, 2027

Fixed Distance 50K

Clinton Lake Ultra

205 days away
48 km Distance
not publishedn/a Climbing
2.4 est Grit · Entry level

Calculated from 48 km alone — the organiser has not published an elevation profile. Read 2.4 as a floor, not a verdict.

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42.8423° N, 84.5691° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 8 hours 10:00 min/km average. Generous. Walkable throughout for most of the field. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Tighter than 79% of 50K races. Measured against 982 races of the same distance. Cut-off calculator →
Field size ~37 Small. Long stretches with nobody in sight.

DUV results for the 2026 edition (30mi) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, March

Daytime high 6°C
Night low -4°C
Rainfall Mostly dry
Daylight 12 h 26 m of light

Regional 2001-2020 average for March — NASA POWER, grid elevation 237 m. Not a forecast.

The Aid Station

Course-specific beta from the community

👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

Gear for this race

Chosen for 48 km of trail.

  • Trail Running Shoes 48 km of trail — cushioning that is still there in the last quarter.
  • Race Nutrition 48 km of self-supported fuelling between aid stations.
  • Hydration Vests Flask capacity for 48 km, without the bounce.
  • GPS Watches Battery life first — a 48 km day outlasts most full-GPS modes.

Adidas

Terrex Speed Ultra

★★★★★ 4.5

La Sportiva

Prodigio Pro

$225 ★★★★★ 4.6

Spring Energy

Awesome Sauce

Real food gel with 180 calories. Rice-based with natural flavors.

$4 ★★★★★ 4.6

Salomon

ADV Skin 12

Industry-standard 12L race vest with front flask pockets and minimal bounce.

$180 ★★★★★ 4.8

COROS

APEX 2 Pro

GPS running watch with 75-hour GPS battery, topo maps, and training metrics.

$500 ★★★★★ 4.7
All gear guides →

Course Notes

Three loops of 10 mile trail through forest, hills, and meadows at Clinton Lake State Recreation Area. Almost all single-track trail except for small section on road & bridge that connects two sides of the trail loop around the lake.

Similar races

Other 50K trail ultras, closest in distance first.