| 400 Freestyle Relay | ||||
| State Record: 3:10.17 National Record: 2:59.98 All-American Automatic: 3:09.44 All-American Consideration: 3:18.00 1998 Qualifying Time: 3:29.88 | ||||
| Rank | School | Names | Time | Date |
| 1 | WEST DES MOINES DOWLING | Sourbeer-11,Fitzgerald-12,Heidt-12,Ferguson-12 | 3:21.99 | 12/8/98 |
| 2 | WEST DES MOINES VALLEY | Smith-12,Mercuris-10,Welling-9,Snider-11 | 3:26.16 | 12/8/98 |
| 3 | BETTENDORF | Stonebreaker-12,Anderson-12,Lonergan-11,Renner-Arjes-12 | 3:26.74 | 12/5/98 |
| 4 | CR KENNEDY | Waldhuetter,Mohwinkle-12,Hackney-10,Nickell-11 | 3:26.83 | 12/16/98 |
| 5 | CEDAR FALLS | 3:27.58 | 12/12/98 | |
| 6 | URBANDALE | Dane-12,Kroeger-12,Jablonski-11,Mandsager-11 | 3:31.89 | 12/5/98 |
| 7 | MUSCATINE | Fuller-12,Rexroth-11,Lear-12,Collins-9 | 3:32.50 | 12/19/98 |
| 8 | CR WASHINGTON | Griffith-12,Weber-11,Fishleder-12,Janes-12 | 3:32.75 | 12/17/98 |
| 9 | OTTUMWA | McCord-12,DeBoef-10,Evans-9,Matzen-11 | 3:33.78 | 12/17/98 |
| 10 | MASON CITY | Powell-9,Marsters-12,Sawyer-11,Duffy-9 | 3:34.12 | 12/5/98 |
| 11 | ANKENY | George-12,VerHuel-11,Blessman-10,Brent-12 | 3:34.29 | 12/3/98 |
| 12 | AMES | Saxton-9,Healey-12,McDuff-11,Miller-12 | 3:34.69 | 12/12/98 |
| 13 | MARSHALLTOWN | Kremer-12,Grumstrup-11,Allen-12,Blum-11 | 3:34.71 | 12/3/98 |
| 14 | PLEASANT VALLEY | Albert-10,Jackson-10,Graham-9,Kuykendall-10 | 3:36.13 | 12/17/98 |
| 15 | GRINNELL | 3:36.44 | 12/17/98 | |
| 16 | SOUTHEAST POLK | Bauer-11,White-9,Holcomb-10,Fix-12 | 3:37.71 | 12/5/98 |
| 17 | CF - NU HIGH | 3:37.78 | 12/12/98 | |
| 18 | DBQ HEMPSTEAD | Westhoff-12,Clark-11,Kolfenbach-11,Kukla-11 | 3:37.87 | 12/15/98 |
| 19 | CARROLL | Nobling-12,Stoolman-10,Stoolman-12,Schumacher-12 | 3:38.36 | 12/15/98 |
| 20 | DM HOOVER | Thorsen-10,Dante-12,Monroe-12,Kozitza-12 | 3:38.78 | 12/17/98 |
| 21 | IOWA CITY | Yack-11,Officer-11,Luebke-11,Talman-12 | 3:38.82 | 12/17/98 |
| 22 | CR JEFFERSON | Wiggins-10,Borrett-11,Simoens-12,Scott-12 | 3:39.75 | 12/12/98 |
| 23 | DBQ SENIOR | Gavin-12,Oberhoffer-12,Blair-11,Koenig-11 | 3:40.31 | 12/19/98 |
| 24 | SIOUX CITY METRO | Coad-12,Schmitz-12,Hoing-10,Stevenson-9 | 3:40.73 | 12/15/98 |
| 25 | DM ROOSEVELT | Stroope-12,Adelman-12,Karney,Dewdney-12 | 3:41.30 | 12/5/98 |
| 26 | CB ABRAHAM LINCOLN | L.Hale-9,Landstrom-12,Tovrea-12,J.Hale-12 | 3:41.41 | 12/10/98 |
| 27 | BURLINGTON | Champagne-12,Frank-12,Hinnen-12,Cooper-11 | 3:44.11 | 12/17/98 |
| 28 | SIOUX CITY EAST | Kruse-12,Carnes-9,Cole-11,Reinking-12 | 3:44.32 | 12/15/09 |
| 29 | DM LINCOLN | Durbin,Andrianse-12,Lichtenberger-11,Eschilman | 3:47.08 | 12/8/98 |
| 30 | BOONE | Reece-11,Phelps-10,Moeller-12,Briggs-11 | 3:47.27 | 12/17/98 |
| 31 | LINN-MAR | Birkland-12,Bloom,Russell-9,Landherr-10 | 3:47.50 | 12/10/98 |
| 32 | DAVENPORT WEST | Monroe,Detoye,LeCount,Lundberg | 3:51.02 | 12/19/98 |
| 33 | NEWTON | Allen-12,Parks-11,Marshall,Landon-9 | 3:51.67 | 12/8/98 |
| 34 | DAVENPORT CENTRAL | Hollonbeck,Conrad,Jensen,Scherler | 3:54.75 | 12/10/98 |
| 35 | STORM LAKE | Havens,Cook,Davis,Larson | 3:58.17 | 12/15/98 |
| 36 | CLINTON | Holland,Burggraaf,Trimble,Goodridge | 4:00.45 | 12/19/98 |
| 37 | CHARLES CITY | Coulson-12,Harless-11,Nelson-12,Hart-12 | 4:06.92 | 12/10/98 |
| 38 | WILLIAMSBURG | 4:09.92 | 12/12/98 | |
| 39 | DM EAST | Barker-11,Evans-10,Froehle-12,Hicks-10 | 4:13.75 | 12/10/98 |
| 40 | FORT DODGE | Huse-10,Huse-12,Schild-12,Kramer-10 | 4:16.25 | 12/8/98 |
| 41 | DECORAH | Lenninger-11,Murray-12,Finanger-9,Schneberger-10 | 4:48.47 | 12/3/98 |
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