Road course · California, USA
Willow Springs International Raceway
Willow Springs International Raceway is a road course in California. OpenStreetMap maps one layout here, 2.45 mi (3.94 km). Below: the map, every corner with a computed line, the elevation, and where to stay and eat.
- 2.45
- Miles
- 9
- Corners
- 154
- Ft of elevation
01Track map
Big Willow track map
Full circuit
Name inferred by TRACK from the mapped loops, not an official layout name.
- Mapped length
- 2.45mi
- 3.94 km
- Direction
- Not mapped
- TRACK takes it from your first drive.
- Start/finish line
- Estimated
- Estimated by TRACK from the mapped geometry and not verified on site. TRACK asks you to confirm or move it before timing laps here, when you’re stopped.
- Published length (cross-check)
- 2.50 mi · mapped loop agrees within 3%
- Corners
- 9
- Inferred from curvature, not official turn numbers
- Sectors
- 3
- Estimated, near each third of the lap
Source geometry: OpenStreetMap ↗. Something wrong? Fixing it in OpenStreetMap improves it for everyone.
02Overview
What Big Willow is like to drive.
The full circuit layout at Big Willow is 2.45 miles with 9 corners worth setting up for and about 154 ft of elevation change. A generic track-day car in our model brakes hard 6 times a lap and is at full throttle for about 44% of the distance; the longest straight runs roughly 1411 ft.
0 of the corners are slow (under 50 mph in the model), 4 are fast (over 75 mph). There are hairpins where exit speed matters more than entry. Some apexes sit on crests, where the car goes light. The corner notes below come from the mapped geometry, not from local knowledge; we’ll add a researched guide for Big Willow later.
03Lap at a glance
Where the speed is, and where the hills are.
- Length
- 2.45mi
- Elevation range
- 154ft
- Steepest grade
- 11%
- Braking zones
- 6model
- Full throttle
- 44% model
- Longest straight
- 1411ft
The speed trace is a model, not a real lap: a generic track-day car (about 1.1 g of cornering grip, 1 g braking, 150 W/kg) driven on the computed line through an assumed 12 m wide track. Use it to see where the braking zones and flat-out sections are, not to predict your speeds. Elevation: USGS 3DEP 1/3 arc-second (NED 10 m) via OpenTopoData, sampled every 25 m along the mapped centerline.
04Corner by corner
The corners at Big Willow.
TRACK’s own corner numbering (C1, C2…), found from the curvature of the mapped centerline. It isn’t the official turn numbering. Each diagram shows the computed line: the minimum-curvature path through an assumed 12 m wide track. It’s a geometric starting point. Your instructor’s line comes first.
- C1
Fast left-hander
↰ LeftfastcornerTRACK numbering
A fast left-hand corner that turns about 119°, tightening to a radius of roughly 50 m (164 ft). The model car brakes for about 155 m (509 ft), from 136 to 82 mph. The computed line turns in from the right side, takes an apex close to the geometric apex, and lets the car run out to the right on exit.
- Turns
- 119° left
- Tightest radius
- 50 m
- Model speed
- 136 → 82 mph
- Braking (model)
- 155 m
- Grade
- +0.8%
- C2
Fast left-hander
↰ LeftfastkinkTRACK numbering
A fast left-hand kink that turns about 26°, tightening to a radius of roughly 117 m (384 ft). The model car barely brakes here, carrying about 112 mph: a lift or a confident throttle balance. The computed line turns in from the right side, takes an early apex, about 5 m before the geometric apex, and lets the car run out to the right on exit.
- Turns
- 26° left
- Tightest radius
- 117 m
- Model speed
- ≈ 112 mph
- Braking (model)
- Lift / none
- Grade
- +1.2%
- C3
Fast left-hander
↰ LeftfastcornerTRACK numbering
A fast left-hand corner that turns about 47°, tightening to a radius of roughly 89 m (292 ft). The apex sits on a crest, so expect the car to go light. The model car brakes for about 55 m (180 ft), from 101 to 78 mph. The computed line turns in from the right side, takes a late apex, about 55 m after the corner’s geometric apex, and lets the car run out to the right on exit.
- Turns
- 47° left
- Tightest radius
- 89 m
- Model speed
- 101 → 78 mph
- Braking (model)
- 55 m
- Grade
- +0.7% · crest
- C4
Medium right-hander
↱ RightmediumessesTRACK numbering
A medium right-hand esses that turns about 84°, tightening to a radius of roughly 32 m (105 ft). It climbs through the corner (about 4% grade). The model car brakes for about 140 m (459 ft), from 101 to 58 mph. The computed line turns in from the left side, takes an early apex, about 5 m before the geometric apex, and lets the car run out to the left on exit.
- Turns
- 84° right
- Tightest radius
- 32 m
- Model speed
- 101 → 58 mph
- Braking (model)
- 140 m
- Grade
- +3.5%
- C5
Medium left-hander
↰ LeftmediumessesTRACK numbering
A medium left-hand esses that turns about 43°, tightening to a radius of roughly 80 m (262 ft). It climbs through the corner (about 9% grade). The model car brakes for about 140 m (459 ft), from 101 to 58 mph. The computed line turns in from the right side, takes an early apex, about 5 m before the geometric apex, and lets the car run out to the right on exit.
- Turns
- 43° left
- Tightest radius
- 80 m
- Model speed
- 101 → 58 mph
- Braking (model)
- 140 m
- Grade
- +9.2%
- C6
Medium left-hander
↰ LeftmediumhairpinTRACK numbering
A medium left-hand hairpin that turns about 148°, tightening to a radius of roughly 33 m (108 ft). It drops through the corner (about 5% grade) and goes over a crest, so the car goes light at the apex. The model car brakes for about 105 m (344 ft), from 91 to 53 mph. The computed line turns in from the right side, takes a late apex, about 105 m after the corner’s geometric apex, and lets the car run out to the right on exit.
- Turns
- 148° left
- Tightest radius
- 33 m
- Model speed
- 91 → 53 mph
- Braking (model)
- 105 m
- Grade
- -4.6% · crest
- C7
Medium right-hander
↱ RightmediumessesTRACK numbering
A medium right-hand esses that turns about 109°, tightening to a radius of roughly 41 m (135 ft). It drops through the corner (about 8% grade). The model car barely brakes here, carrying about 57 mph: a lift or a confident throttle balance. The computed line turns in from the left side, takes an apex close to the geometric apex, and lets the car run out to the left on exit.
- Turns
- 109° right
- Tightest radius
- 41 m
- Model speed
- ≈ 57 mph
- Braking (model)
- Lift / none
- Grade
- -8.0%
- C8
Fast left-hander
↰ LeftfastcornerTRACK numbering
A fast left-hand corner that turns about 209°, tightening to a radius of roughly 85 m (279 ft). It drops through the corner (about 3% grade). The model car barely brakes here, carrying about 85 mph: a lift or a confident throttle balance. The computed line turns in from the right side, takes an early apex, about 35 m before the geometric apex, and lets the car run out to the right on exit.
- Turns
- 209° left
- Tightest radius
- 85 m
- Model speed
- ≈ 85 mph
- Braking (model)
- Lift / none
- Grade
- -3.4%
- C9
Medium right-hander
↱ RightmediumcornerTRACK numbering
A medium right-hand corner that turns about 89°, tightening to a radius of roughly 60 m (197 ft). The apex sits on a crest, so expect the car to go light. The model car brakes for about 135 m (443 ft), from 110 to 70 mph. The computed line turns in from the left side, takes an early apex, about 5 m before the geometric apex, and lets the car run out to the left on exit.
- Turns
- 89° right
- Tightest radius
- 60 m
- Model speed
- 110 → 70 mph
- Braking (model)
- 135 m
- Grade
- -1.2% · crest
05Time it with TRACK
Drive Big Willow. TRACK knows where you are.
No setup and no transponder. Start a session in the paddock and TRACK recognises Big Willow and the layout from your GPS trace, then times every lap and sector with a live delta to your best.
- 1DetectTRACK matches your first few hundred metres against every mapped layout at Big Willow, including shared pavement between configurations.
- 2Confirm the lineThe start/finish line here is estimated. When you’re stopped, TRACK shows it on the map: accept it or tap to move it. You’re never asked while driving.
- 3Laps, timed retroactivelyLaps you drove before confirming are timed from the recorded trace, so you don’t lose your first session.
- 4Go furtherSync a GoPro for video with telemetry and let TRACK Engineer point out where the time is. External 10–25 Hz GPS receivers for tighter sectors are awaiting hardware validation.
- Venue and layout detection is tested on simulated drives over real OpenStreetMap circuits, not yet in a real car. Compatible GPS receivers
06Plan your trip
Getting there, staying, eating.
Nearby places for Big Willow haven’t been loaded yet.
07Track days
Find an open track day at Big Willow.
TRACK doesn’t copy event listings. An on-page calendar will come with an organizer data partnership.
Before your first day here
08Nearby tracks
Closest mapped venues.
- Streets of Willow SpringsCalifornia · 0 mi away
- Buttonwillow Raceway ParkCalifornia · 84 mi away
- The Thermal ClubCalifornia · 149 mi away
- Spring Mountain Motor ResortNevada · 160 mi away
Straight-line distance between venues. All 96 tracks
FAQ
Big Willow, answered.
How long is Big Willow?
The mapped centerline of Willow Springs International Raceway is 2.45 mi (3.94 km) in OpenStreetMap, against a published 2.50 mi. Published lengths are measured differently, so small differences are normal.
How much elevation change is there at Big Willow?
About 154 ft (47 m) between the lowest and highest points of the full circuit layout, from USGS 3DEP elevation data sampled every 25 m. The steepest stretch is around 11%.
Which direction does Big Willow run?
OpenStreetMap doesn’t record a direction for the main layout at Big Willow. Venues sometimes run both ways. TRACK takes the direction from your first laps.
Can I time laps at Big Willow with my phone?
Yes, with the TRACK iPhone app (beta). It recognises Big Willow and the layout you’re driving from GPS, then times laps and sectors. A phone’s GPS is good for lap times; an external 10–25 Hz receiver tightens sector splits.
Where is the start/finish line at Big Willow?
TRACK estimates the line from the mapped geometry (usually beside the pit lane, or on the longest straight). It isn’t verified on site, so the app asks you to confirm or move it before timing your first session here.
How do I find track days at Big Willow?
Clubs and organizers list HPDE, track days and club races on MotorsportReg. The venue’s own calendar lists its events too. TRACK doesn’t list events itself.
Where can I stay near Big Willow?
This page lists hotels, campgrounds, restaurants, fuel and parts stores near Big Willow from OpenStreetMap, with straight-line distances. Book early for big event weekends.
Track geometry and nearby places: © OpenStreetMap contributors, available under the Open Database License 1.0 (via the TRACK Atlas, snapshot 2026-10-17). Elevation: USGS 3DEP (public domain). Lengths are mapped centerlines, not official figures. The computed line and speed trace are a model. No start/finish line has been verified on site.
TRACK is not affiliated with or endorsed by Willow Springs International Raceway, MotorsportReg or any business listed here. The venue name identifies the location only and belongs to its owner. TRACK shows no lap records or official results for this venue. Driving advice is general: your instructor, the event’s rules and the venue’s rules come first.