Is crew access allowed on the 100 Mile course?

Yes, crew access is allowed on the 100 Mile course. Runners are allowed ONE crew vehicle. Crew vehicles must display their Crew Pass on the dashboard at all times during the race. Crew is allowed only at the following Aid Stations: Aid Station #1/Olallie Lake (mile 12); Aid Station #5 & 10/Clackamas (mile 40 & mile 72); Aid Station #9/Dam (mile 68); Aid Station #14/Olallie Meadows (mile 97). Crew and vehicles are not allowed at any of the other aid stations.

Are drop bags allowed on the 100 Mile course?

Yes, drop bags are allowed on the 100 Mile course. There are two drop bag locations; Olallie Lake mile 12 and at Clackamas miles 40 & 72. Drop bags are returned to the finish by 2 p.m. Sunday. Drop bags should be no more than 21 cubic liters (1,281 cubic inches). One drop bag per aid station. Pacers are not allowed to have a drop bag.

Are pacers allowed on the 100 Mile course?

Yes, pacers are allowed on the 100 Mile course. Runners are allowed to pick up a pacer at the Clackamas Aid Station #10 (as runners pass through the second time at mile 72), and at Olallie Meadows (for the final 3.6 miles the finish). Runners are allowed only one pacer to run with them at a time.

What is the cutoff time for the 100 Mile course?

The overall time limit for the 100 Mile course is 30 hours from the start. Runners that do not depart prior to the cutoffs are not allowed to continue.

Ultras · US · OR

Mountain Lakes 100

On the calendar

The date is set. Entry has not opened.

Race dateSeptember 18-19, 2027

Duration2 days

Start8:00am

Whenin 337 days

First held2014

Who's going to Mountain Lakes 100?

I'm running itPlan your weeks and your aid station times I'm crewingWhen to leave, where to park, at every stop I'm pacing or cheeringAsk your runner for their Out Here link

Free. You can start with nothing.

Official website Aid stations Notify me if this race changes

Free, and always will be. NavRun makes money from race-day planning for runners who want it, never from this. Ultras change constantly, sometimes the morning of. Always confirm with the race director and the official website before you rely on anything here.

Distance 101.3 miles

Climb 11,700 ft

Descent 11,700 ft

High point 5,700 ft

Time limit 30:00:00

Aid stations 16

Started not checked yet

Finished not checked yet

Finish rate not checked yet

The course

Where it goes · 16 aid stations

The race

What this one is

A 101-mile point-to-point-and-back style ultramarathon on the Pacific Crest Trail south of Olallie Lake, Oregon, starting and finishing at Olallie Lake Resort and running between Mt. Jefferson and Mt. Hood.

The Olallie Lake start/finish area was burned in the 2020 Lionshead Fire and was unavailable for the 2021 and 2022 editions, which used a different venue; the race returned to Olallie Lake for a modified loop of the original route in 2023.

Getting in

Getting in Entry, lottery and what the race asks of you before race day.

Lottery: not checked yet

Lottery opens: not checked yet

Lottery draw: not checked yet

Field cap: 150 gobeyondracing.com

Registration: UltraSignup gobeyondracing.com

Qualifying: Western States 100 Qualifier gobeyondracing.com

Minimum age: not checked yet

Transfers: No gobeyondracing.com

Deferrals: not checked yet

Running, crewing, pacing or still deciding

How NavRun helps with Mountain Lakes 100 Thirty hours, and two stations with a clock on each.

You are running it

You reach Clackamas, mile 40.4, before its 8:00pm cutoff, and you already knew that this morning.

An arrival time for all 14 stations, worked out from your own training.

Start free →

You are pacing

You are at Clackamas, mile 71.7, warm and fed, and you know you have 30 miles ahead of you.

The same sheet says when they reach you.

You are deciding

You find out Mountain Lakes 100 is months of work away, not years, and you go and get the qualifier.

Put in a race you have already run. NavRun shows you where this one sits from where you are.

No account needed →

Crew access, pacers and drop bags

The rules that shape your day Anything marked "not checked yet" is a gap in what we hold, never a no from the race.

Crew allowed: Yes gobeyondracing.com

Vehicles per runner: 1 gobeyondracing.com

Pacers: Yes gobeyondracing.com

Muling: Allowed gobeyondracing.com

Drop bags: Yes gobeyondracing.com

Cupless: Yes gobeyondracing.com

Course marking: not checked yet

Night running: not checked yet

Dogs: not checked yet

Headphones: not checked yet

Crew rules: Runners are allowed ONE crew vehicle. Crew vehicles must display their Crew Pass on the dashboard at all times during the race. Crew is allowed only at the following Aid Stations: Aid Station #1/Olallie Lake (mile 12); Aid Station #5 & 10/Clackamas (mile 40 & mile 72); Aid Station #9/Dam (mile 68); Aid Station #14/Olallie Meadows (mile 97). Crew and vehicles are not allowed at any of the other aid stations. gobeyondracing.com

Pacer rules: Runners are allowed to pick up a pacer at the Clackamas Aid Station #10 (as runners pass through the second time at mile 72), and at Olallie Meadows (for the final 3.6 miles the finish). Runners are allowed only one pacer to run with them at a time. gobeyondracing.com

Drop bag rules: There are two drop bag locations; Olallie Lake mile 12 and at Clackamas miles 40 & 72. Drop bags are returned to the finish by 2 p.m. Sunday. Drop bags should be no more than 21 cubic liters (1,281 cubic inches). One drop bag per aid station. Pacers are not allowed to have a drop bag. gobeyondracing.com

Cutoff philosophy: Runners that do not depart prior to the cutoffs are not allowed to continue. gobeyondracing.com

Aid stations

Every stop, and what you get there ● yes ○ no ? nobody has checked – does not apply to this race

Mile	Station	Cutoff	Crew access	Bag	Pacer	Med	To next
?	Start	?	?	?	?	?	?
12.20	Olallie Lake	?	●	●	?	?	10.20
22.40	Pinheads	?	○	○	?	?	7.20
29.60	Warm Springs	?	○	○	?	?	5.50
35.10	Red Wolf	?	○	○	?	?	5.30
40.40	Clackamas	8:00pm	●	●	?	?	6.10
46.50	Little Crater Lake	?	○	○	?	?	8.10
54.60	Frog Lake	?	○	○	?	?	8.10
62.70	Little Crater Lake	?	○	○	?	?	5.00
67.70	Dam	?	●	○	?	?	4.00
71.70	Clackamas	5:00am	●	●	●	?	5.30
77.00	Red Wolf	?	○	○	?	?	5.50
82.50	Warm Springs	?	○	○	?	?	7.20
89.70	Pinheads	?	○	○	?	?	8.00
97.70	Olallie Meadows	?	●	○	●	?	3.60
101.30	Finish	2:00pm	●	●	?	?	?

Same race, other lines

Other distances and other years

Other years: 2026

What it looks like out there

Somebody has been out there with a camera the tables say the climb is long. these say what long feels like.

3 people have been out there with a camera or a microphone.

Social account

Go Beyond Racing on Instagram

Social account

Go Beyond Racing on Facebook

Social account

Official channel

Go Beyond Racing on YouTube

Official channel

All (3) Official channel (1) Social account (2)

These are other people's work and we link straight to them. Watching costs nothing and needs no account. More of them: every race we hold, on film.

Add to this page

What you know every one of these is read by a person before it changes anything

Ran this race? Tell the next runner what you know.

Nobody sees it until we have read it. No account, no sign-in.

Which distance? Leave blank if it applies to the whole race.

Which stop? Leave blank if it is not about one particular stop.

Give it a short title: Optional. Something like “Cal Street, mile 62 to 78”.

What do you wish someone had told you? Write it the way you would say it to someone at the start line.

Were you there? Optional, and it decides nothing. It only tells the next runner where this is coming from.

What year? Optional.

Your email: Optional, and never shown on the page. Only so we can ask you a question about this note.

Website: Leave this field blank.

See something wrong or out of date? Suggest an edit.

This changes nothing on the page on its own. Somebody checks it against the race first.

Which detail? Optional. Filled in for you when you start from a specific line on the page.

What does the page say now? Copy it as it appears, so we can find it.

What should it say? The corrected value.

How do you know? Required. Where it came from: the race email, the runner manual, what you saw on the day.

A link that shows it: Optional.

Or a photo of it: Optional. A screenshot or a photo of the sign works.

Were you there? Optional, and it decides nothing.

What year? Optional.

Your email: Optional, only so we can come back to you about this correction.

Which distance? Leave blank if it is about the whole race.

Which stop? Leave blank if it is not about one particular stop.

Website: Leave this field blank.

Seen a course preview or a film of this one? Send it over.

Somebody watches it before it goes anywhere near this page. What we are after is footage of this course, on the ground. If it would be just as true of any other race, it is not this.

What does it show that the page cannot? Required. A line is plenty. Where the climbs are, what the footing does, what the last twenty miles look like.

Were you there? Optional, and it decides nothing.

What year? Optional.

Your email: Optional, and never shown on the page. Only so we can ask you a question about this one.

Where is it? A YouTube link, a race report, a photo gallery, whatever it is.

What kind of thing is it?

Who made it? Optional, and we credit them on the page.

Website: Leave this field blank.

Have the GPX? Send us the link.

We want the address of the file the race publishes, not the file. We download it from there so the page can say where the line came from.

Are you the race director? Get in touch and we'll make it right.

We read every one of these and we write back. Every fact here carries the source it came from, and the way a wrong one gets fixed is a person checking it against what you tell us.

Where this came from. Every fact on this page records its source and when we last checked it: 140 sources for this race. Hover a source link to read the sentence it came from.

43% of what we track for a course is filled in. The rest says "not checked yet" rather than guessing.

See something wrong or out of date? Suggest an edit
Ran this race? Tell the next runner what you know
Got footage of this course? Send us the link
Are you the race director? Get in touch and we'll make it right.
Anything else: [email protected]

Ultras change. We will tell you when this one does.

Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.

No account, and nothing to cancel.

What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.

I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.