The 1999 Rose City Grand Prix was the fifth round of the 1999 American Le Mans Series season. It took place at Portland International Raceway, Oregon, on August 1, 1999.
Class winners in bold.
| Pos | Class | No | Team | Drivers | Chassis | Tyre | Laps |
|---|---|---|---|---|---|---|---|
| Engine | |||||||
| 1 | LMP | 1 |  Panoz Motor Sports |  David Brabham Éric Bernard | Panoz LMP-1 Roadster-S | 137 | |
| Ford (Élan-Yates) 6.0 L V8 | |||||||
| 2 | LMP | 42 |  BMW Motorsport Schnitzer Motorsport |  JJ Lehto Steve Soper | BMW V12 LMR | 137 | |
| BMW S70 6.0 L V12 | |||||||
| 3 | LMP | 2 | Panoz Motor Sports | Johnny O'Connell Jan Magnussen | Panoz LMP-1 Roadster-S | 137 | |
| Ford (Élan-Yates) 6.0 L V8 | |||||||
| 4 | LMP | 43 | BMW Motorsport Schnitzer Motorsport | Joachim Winkelhock Bill Auberlen | BMW V12 LMR | 136 | |
| BMW S70 6.0 L V12 | |||||||
| 5 | LMP | 27 | Price & Bscher | Thomas Bscher Pedro Lamy | BMW V12 LM | 134 | |
| BMW S70 6.0 L V12 | |||||||
| 6 | LMP | 16 | Dyson Racing | Elliott Forbes-Robinson James Weaver Ron Fellows | Riley & Scott Mk III | 134 | |
| Ford 5.0 L V8 | |||||||
| 7 | LMP | 0 |  Team Rafanelli SRL | Érik Comas Mimmo Schiattarella | Riley & Scott Mk III | 134 | |
| Judd GV4 4.0 L V10 | |||||||
| 8 | LMP | 38 | Champion Racing | Allan McNish Andy Pilgrim | Porsche 911 GT1 Evo | 133 | |
| Porsche 3.2 L Turbo Flat-6 | |||||||
| 9 | LMP | 11 | Doyle-Risi Racing | Max Angelelli Didier de Radiguès | Ferrari 333 SP | 131 | |
| Ferrari F310E 4.0L V12 | |||||||
| 10 | LMP | 18 | Dollahite Racing | Bill Dollahite Mike Davies | Ferrari 333 SP | 130 | |
| Ferrari F310E 4.0 L V12 | |||||||
| 11 DNF | LMP | 12 | Doyle-Risi Racing | Alex Caffi Wayne Taylor | Ferrari 333 SP | 129 | |
| Ferrari F310E 4.0 L V12 | |||||||
| 12 | LMP | 36 | Doran Lista Racing Jim Matthews Racing |  Stefan Johansson Jim Matthews | Ferrari 333 SP | 128 | |
| Ferrari F310E 4.0 L V12 | |||||||
| 13 | GTS | 91 | Dodge Viper Team Oreca | Olivier Beretta David Donohue | Dodge Viper GTS-R | 126 | |
| Dodge 8.0 L V10 | |||||||
| 14 | GTS | 92 | Dodge Viper Team Oreca |  Karl Wendlinger Tommy Archer | Dodge Viper GTS-R | 126 | |
| Dodge 8.0 L V10 | |||||||
| 15 | GTS | 61 | Konrad Motorsport | Franz Konrad Bob Wollek | Porsche 911 GT2 | 125 | |
| Porsche 3.6 L Turbo Flat-6 | |||||||
| 16 DNF | LMP | 28 | Intersport Racing | Jon Field Niclas Jönsson | Lola B98/10 | 124 | |
| Ford (Roush) 6.0 L V8 | |||||||
| 17 | GTS | 56 | Martin Snow Racing | Martin Snow Kelly Collins | Porsche 911 GT2 | 123 | |
| Porsche 3.6 L Turbo Flat-6 | |||||||
| 18† | GT | 23 | Manthey Racing Alex Job Racing | Dirk Müller Cort Wagner | Porsche 911 GT3-R | 122 | |
| Porsche 3.6 L Flat-6 | |||||||
| 19 | GT | 7 | Prototype Technology Group | Brian Cunningham Christian Menzel | BMW M3 | 121 | |
| BMW 3.2 L I6 | |||||||
| 20 | GT | 10 | Prototype Technology Group | Darren Law Johannes van Overbeek | BMW M3 | 121 | |
| BMW 3.2 L I6 | |||||||
| 21 | GT | 17 | Contemporary Motorsports | Joe Varde Bruno Lambert | Porsche 911 Carrera RSR | ? | 120 |
| Porsche 3.8 L Flat-6 | |||||||
| 22 | GT | 02 | Reiser Callas Rennsport | Doc Bundy David Murry | Porsche 911 Carrera RSR | 120 | |
| Porsche 3.8 L Flat-6 | |||||||
| 23 DNF | GT | 6 | Prototype Technology Group | Peter Cunningham Mark Simo | BMW M3 | 119 | |
| BMW 3.2 L I6 | |||||||
| 24 | GT | 22 | Alex Job Racing | Mike Fitzgerald Darryl Havens | Porsche 911 Carrera RSR | 119 | |
| Porsche 3.8 L Flat-6 | |||||||
| 25 | GT | 68 | The Racer's Group | Spencer Trenery Vic Rice | Porsche 911 Carrera RSR | 119 | |
| Porsche 3.8 L Flat-6 | |||||||
| 26 | GT | 24 | Alex Job Racing | Randy Pobst Don Kitch | Porsche 911 Carrera RSR | 119 | |
| Porsche 3.8 L Flat-6 | |||||||
| 27 | GT | 03 | Reiser Callas Rennsport | Grady Willingham Joel Reiser Craig Stanton | Porsche 911 Carrera RSR | 118 | |
| Porsche 3.8 L Flat-6 | |||||||
| 28 DNF | GTS | 48 | Freisinger Motorsport | Wolfgang Kaufmann Michel Ligonnet | Porsche 911 GT2 | 115 | |
| Porsche 3.6 L Turbo Flat-6 | |||||||
| 29 | LMP | 63 | Downing Atlanta | Jim Downing Chris Ronson | Kudzu DLY | 115 | |
| Mazda R26B 2.6 L 4-Rotor | |||||||
| 30 DNF | LMP | 97 | Team Cascadia | Ed Zabinski Shane Lewis | Lola B98/10 | 113 | |
| Chevrolet 6.0 L V8 | |||||||
| 31 | LMP | 29 | Intersport Racing | Paul Debban Bruce Trenery | Riley & Scott Mk III | 111 | |
| Ford (Roush) 6.0 L V8 | |||||||
| 32 | GT | 65 | Pregrid Motorsports | John Brosius Jonathan Fay | Porsche 911 3.8 Cup | ? | 110 |
| Porsche 3.8 L Flat-6 | |||||||
| 33 | LMP | 8 | Transatlantic Racing | Scott Schubot Henry Camferdam | Riley & Scott Mk III | 108 | |
| Ford 5.0 L V8 | |||||||
| 34 DNF | GTS | 55 | Saleen/Allen Speedlab | Terry Borcheller Ron Johnson | Saleen Mustang SR | 106 | |
| Ford 8.0 L V8 | |||||||
| 35 DNF | GT | 25 | RWS Motorsport | Hans-Jörg Hofer Luca Riccitelli | Porsche 911 GT3-R | 86 | |
| Porsche 3.6 L Flat-6 | |||||||
| 36 DNF | GTS | 83 | Chiefie Motorsports | Stefano Buttiero Zak Brown | Porsche 911 GT2 | ? | 70 |
| Porsche 3.6 L Turbo Flat-6 | |||||||
| 37 DNF | LMP | 74 | Robinson Racing | George Robinson Jack Baldwin | Riley & Scott Mk III | ? | 49 |
| Chevrolet 6.0 L V8 | |||||||
| 38 DNF | LMP | 27 | Doran Lista Racing | Didier Theys Fredy Lienhard | Ferrari 333 SP | 41 | |
| Ferrari F310E 4.0 L V12 | |||||||
| 39 DNF | LMP | 15 | Hybrid R&D | Chris Bingham Ross Bentley | Riley & Scott Mk III | 34 | |
| Ford 5.0 L V8 | |||||||
| 40 DNF | LMP | 20 | Dyson Racing | Butch Leitzinger Elliott Forbes-Robinson | Riley & Scott Mk III | 9 | |
| Ford 5.0 L V8 | |||||||
| 41 DNF | GT | 9 | Prototype Technology Group | Boris Said Hans-Joachim Stuck | BMW M3 | 8 | |
| BMW 3.2 L I6 | |||||||
| 42 DNF | GT | 67 | The Racer's Group | Kevin Buckler Kim Wolfkill Kimberly Hiskey | Porsche 911 Carrera RSR | 0 | |
| Porsche 3.8 L Flat-6 |
† - #18 Manthey Racing was found to be in violation of PSCR regulations in post-race inspection, the car being below the minimum legal ride height. Manthey Racing and their drivers were penalized by not winning championship points in this round.