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About RaceIndexOur methodologyData coverageCyclingTriathlon
  • Half Marathon
  • 20.9 km
  • Mandan
  • Event weekend starts
  • Past event

Otter Creek Trail Run (Mandan) Half Marathon

This race edition

Race date
Date not confirmed for this distance
Race timezone
Timezone not confirmed
Edition status
Status not confirmed

Entry options

2026 edition

Entry options are not yet confirmed for this edition. Check the organiser before making plans.

Modelled energy-cost change 2.3% versus flat · net elevation 2 m

View verified GPS mapOfficial event website ↗
Plan my trainingPlan my paceData current as of

Decision summary

Otter Creek Trail Run (Mandan) Half Marathon at a glance

Route ascent
323 m

Lower than 18% of comparable mapped races

Typical conditions
50/100

Historical race-date favourability, not a forecast

Evidence depth
32 verified facts

Stored GPS route

Quick answers

What runners ask first

Otter Creek Trail Run (Mandan) Half Marathon route map

raceindex.org has a GPS course file for Otter Creek Trail Run (Mandan) Half Marathon, so runners can inspect the route line on the map. Elevation charts and ascent figures appear only when that file includes usable elevation data.

How hilly is the Otter Creek Trail Run (Mandan) Half Marathon?

The Otter Creek Trail Run (Mandan) Half Marathon route has 323 m of ascent, 321 m of descent and an estimated 2.3% grade-adjusted pace penalty versus a flat route.

Where does the Otter Creek Trail Run (Mandan) Half Marathon route go?

The Otter Creek Trail Run (Mandan) Half Marathon route starts at Harmon Lake Recreation Area, Mandan, ND 58554. Underfoot, expect singletrack. It passes Harmon Lake, Harmon Lake singletrack trail system and rolling prairie hills. Trail runs start at 6:00 PM CDT.

What should runners know on race day for the Otter Creek Trail Run (Mandan) Half Marathon?

1. Entry includes chip timing, on-course aid station, a complimentary meal from Hensley's Tasty Truck, and a drink ticket for Gideon's Brewing Company. Two-day off-road festival pairing a Friday evening trail run with Saturday mountain bike races.

Race character

Scenery

  • Countryside
  • Mountain
  • Lakeside
  • Waterfront
  • Coastal
  • Forest

Atmosphere

  • Festival
  • Community
  • Scenic Tour

Terrain

  • Trail
  • Road
  • Beach
Elevation character
Rolling
Technicality
Moderate

Entry, logistics and records

Entry requirements

Entry status
Past event: The listed edition date has passed.

Race day logistics

Aid stations
1
Medal
Top 3 podium recognition plus age group awards across both trail run distances.
Finisher tee
Registration includes free event swag / event t-shirt.

Access and course status

Start
Harmon Lake Recreation Area, Mandan, ND 58554

Course facts

Course type
Loop
Surface
Singletrack
Landmarks
Harmon Lake, Harmon Lake singletrack trail system, rolling prairie hills
Notable features
  • Trail runs start at 6:00 PM CDT
  • entry includes chip timing, on-course aid station, a complimentary meal from Hensley's Tasty Truck, and a drink ticket for Gideon's Brewing Company
  • Part of the 701 Series, a North Dakota race series, hosted by 701 Cycle & Sport
  • two-day off-road festival pairing a Friday evening trail run with Saturday mountain bike races
  • On-site amenities at Harmon Lake include first-come campground sites, a swimming beach, and a playground
  • Run on the Harmon Lake trail system of nearly 20 miles of professionally built singletrack weaving through rolling prairie hills, mixing shaded technical sections, fast-flowing stretches and scenic lake views
  • Long Loop, roughly 12-13 miles (about 20.9 km) of singletrack

How hilly is the Otter Creek Trail Run (Mandan) Half Marathon?

7%22%40%24%7%
  • Steep descent 7%
  • Descent 22%
  • Flat 40%
  • Climb 24%
  • Steep climb 7%
Total ascent
323 m
Net elevation
+2 m
GAP factor
2.3%
Longest climb
520 m at 4.4%
Gradient mix and ascent are derived from the course geometry under our published normalisation, not taken from organiser marketing.

What are typical race-day conditions?

  • 20°CTypical temperature
  • 24 kphTypical wind
  • 2 mmTypical rainfall
  • 50Favourability /100
Typical conditions for the race date and locality, warmer than the endurance-optimal window. These are climatological norms, not a forecast, and are shared across every distance at this event.

More race details

Is the Otter Creek Trail Run (Mandan) Half Marathon flat?

Its normalised GAP factor is 2.3% slower than a flat course, with about 323 m of total ascent.

How we calculated this

Published facts and derived model outputs on this page are tied to stored sources or a published, version-locked methodology. We show the provenance so runners, coaches and organisers can check it. Data on this page is current as of .

Derived numbers use scoring-methodology-v1.0.

Sources used on this page (3)

Read the full methodology →