| 100 Butterfly | ||||||
| State Record: :49.13 National Record: :47.10 All-American Automatic: :50.41 All-American Consideration: :52.60 1998 Qualifying Time: :57.66 | ||||||
| Rank | Last Name | First Name | GR | School | Time | Date |
| 1 | FERGUSON | ZACH | 11 | WDM DOWLING | 0:53.23 | 12/8/98 |
| 2 | SNIDER | JASON | 11 | WDM VALLEY | 0:54.10 | 12/10/98 |
| 3 | BOCKES | SETH | 12 | CEDAR FALLS | 0:54.99 | 12/5/98 |
| 4 | SMITH | MITCH | 12 | WDM VALLEY | 0:55.95 | 12/8/98 |
| 5 | SWEHLA | MATT | 10 | WATERLOO WEST | 0:56.00 | 12/12/98 |
| 6 | FISHLEDER | SAM | 12 | CR WASHINGTON | 0:56.17 | 12/17/98 |
| 7 | STROM | PHILLIP | 11 | CLINTON | 0:56.52 | 12/19/98 |
| 8 | ASPLUND | IAN | 12 | GRINNELL | 0:56.97 | 12/17/98 |
| 9 | KUKLA | JOE | 11 | DBQ HEMPSTEAD | 0:56.99 | 12/15/98 |
| 10 | NICKELL | B.J. | 11 | CR KENNEDY | 0:57.10 | 12/15/98 |
| 11 | STROUSE | BRYANT | 12 | CEDAR FALLS | 0:57.92 | 12/16/98 |
| 12 | MC DUFF | MATT | 11 | AMES | 0:58.07 | 12/17/98 |
| 13 | FULLER | PAT | 12 | MUSCATINE | 0:58.19 | 12/10/98 |
| 14 | ALBERT | MATT | 10 | PLEASANT VALLEY | 0:58.36 | 12/11/98 |
| 15 | DE BOEF | SHAWN | 10 | OTTUMWA | 0:58.54 | 12/10/98 |
| 16 | WOOD | JOHNNY | 9 | WDM VALLEY | 0:58.63 | 12/8/98 |
| 17 | LUEBKE | TYLER | 11 | IOWA CITY | 0:58.80 | 12/17/98 |
| 18 | HUSTON | KELLEN | 11 | ANKENY | 0:58.87 | 1/23/98 |
| 19 | BLUM | TONY | 11 | MARSHALLTOWN | 0:58.88 | 12/3/98 |
| 20 | FRANK | RYAN | 12 | BURLINGTON | 0:58.92 | 12/11/98 |
| 21 | WALDHUETTER | HERBERT | CR KENNEDY | 0:59.40 | 12/16/98 | |
| 22 | ANDERSON | JUSTIN | 12 | BETTENDORF | 0:59.65 | 12/5/98 |
| 23 | PRUISNER | MICAH | 11 | CEDAR FALLS | 0:59.74 | 12/16/98 |
| 24 | ECHTENKAMP | NATE | 12 | WDM VALLEY | 0:59.91 | 12/8/98 |
| 25 | DUFFY | DEREK | 9 | MASON CITY | 1:00.20 | 12/1/98 |
| 26 | COLLINS | MATT | 9 | MUSCATINE | 1:00.30 | 12/17/98 |
| 27 | EVANS | TODD | 9 | OTTUMWA | 1:00.66 | 12/17/98 |
| 28 | JOHNSON | LUKE | 11 | DBQ SENIOR | 1:01.00 | 12/17/98 |
| 29 | RYAN | DAVID | 9 | MUSCATINE | 1:01.10 | 12/12/98 |
| 30 | KUYKENDALL | JOHN | 10 | PLEASANT VALLEY | 1:01.11 | 12/15/98 |
| 31 | FRIZZELL | KELLY | 11 | PLEASANT VALLEY | 1:01.11 | 12/17/98 |
| 32 | HARDY | TOM | 9 | MASON CITY | 1:01.25 | 12/12/98 |
| 33 | STROOPE | TED | 12 | DM ROOSEVELT | 1:01.27 | 12/15/98 |
| 34 | MEACHAM | GARTH | 11 | WDM DOWLING | 1:01.55 | 12/8/98 |
| 35 | GUNTHER | THAD | 12 | MUSCATINE | 1:01.59 | 12/10/98 |
| 36 | YACK | ADAM | 11 | IOWA CITY | 1:01.68 | 12/8/98 |
| 37 | WOLF | RICHARD | 10 | WDM VALLEY | 1:01.85 | 12/15/98 |
| 38 | HEALEY | LUKE | 12 | AMES | 1:01.87 | 12/10/98 |
| 39 | ADRIANSE | JOHN | 12 | DM LINCOLN | 1:01.89 | 12/8/98 |
| 40 | GORDON | KRIS | 12 | VINTON-SHELLSBURG | 1:02.02 | 12/12/98 |
| 41 | STROM | ANDREW | 9 | CLINTON | 1:02.15 | 12/19/98 |
| 42 | FLANNERY | BEN | 11 | URBANDALE | 1:02.30 | 12/5/98 |
| 43 | NOBLING | MIKE | 12 | CARROLL | 1:02.43 | 12/17/98 |
| 44 | SAWYER | RYAN | 11 | MASON CITY | 1:02.51 | 12/5/98 |
| 45 | JOHNSON | JUSTIN | 9 | SC METRO | 1:02.54 | 12/15/98 |
| 46 | HALE | LUCAS | 9 | CB LINCOLN | 1:02.65 | 12/15/98 |
| 47 | MOSHER | MIKE | 11 | WDM VALLEY | 1:02.83 | 12/15/98 |
| 48 | WIECK | NATE | 9 | CF-NU HIGH | 1:02.93 | 12/12/98 |
| 49 | HOING | ADAM | 10 | SC METRO | 1:02.95 | 12/15/98 |
| 50 | FIX | BRYAN | 12 | SE POLK | 1:03.08 | 12/10/98 |
| ALLEN | CASEY | 12 | MARSHALLTOWN | 1:03.69 | 12/3/98 | |
| TOPPIN | PAUL | 11 | CEDAR FALLS | 1:03.70 | 12/5/98 | |
| TALMAN | ANDREW | 12 | IOWA CITY | 1:03.79 | 12/15/98 | |
| CARNES | DOUG | 9 | SC EAST | 1:03.80 | 12/17/98 | |
| DOCHTERMAN | STRAD | 10 | CR WASHINGTON | 1:03.89 | 12/5/98 | |
| KELLY | AARON | 12 | BOONE | 1:03.91 | 12/17/98 | |
| HARRIS | SEAN | 12 | DAV. CENTRAL | 1:03.97 | 12/10/98 | |
| SCHREMPF | BEN | 12 | BETTENDORF | 1:04.07 | 12/10/98 | |
| STONEBREAKER | MARTIN | 12 | BETTENDORF | 1:04.13 | 12/10/98 | |
| MONROE | JOHN | 12 | DM HOOVER | 1:04.20 | 12/5/98 | |
| SODEY | DREW | 9 | OTTUMWA | 1:04.20 | 12/10/98 | |
| SAMPSON | SCOTT | 10 | BETTENDORF | 1:04.24 | 12/10/98 | |
| LICHTENBERGER | BILL | 11 | DM LINCOLN | 1:04.24 | 12/3/98 | |
| KOLFENBACH | JOE | 11 | DBQ HEMPSTEAD | 1:04.41 | 12/21/98 | |
| KIENZLER | MICHAEL | 10 | AMES | 1:04.47 | 12/10/98 | |
| BURGRAFF | NATE | 12 | CLINTON | 1:04.55 | 12/12/98 | |
| HOWE | ANDY | 10 | WDM DOWLING | 1:04.57 | 12/8/98 | |
| REXROTH | CORTNEY | 11 | MUSCATINE | 1:04.95 | 12/19/98 | |
| LUKE | BILL | 11 | SC EAST | 1:05.06 | 12/8/98 |