diff --git a/src/main/java/org/broadinstitute/hellbender/tools/sv/CondenseDepthEvidence.java b/src/main/java/org/broadinstitute/hellbender/tools/sv/CondenseDepthEvidence.java
new file mode 100644
index 00000000000..f6b77564967
--- /dev/null
+++ b/src/main/java/org/broadinstitute/hellbender/tools/sv/CondenseDepthEvidence.java
@@ -0,0 +1,167 @@
+package org.broadinstitute.hellbender.tools.sv;
+
+import htsjdk.samtools.SAMSequenceDictionary;
+import htsjdk.tribble.Feature;
+import org.broadinstitute.barclay.argparser.Argument;
+import org.broadinstitute.barclay.argparser.CommandLineProgramProperties;
+import org.broadinstitute.barclay.argparser.ExperimentalFeature;
+import org.broadinstitute.hellbender.cmdline.StandardArgumentDefinitions;
+import org.broadinstitute.hellbender.cmdline.programgroups.StructuralVariantDiscoveryProgramGroup;
+import org.broadinstitute.hellbender.engine.*;
+import org.broadinstitute.hellbender.exceptions.UserException;
+import org.broadinstitute.hellbender.utils.MathUtils;
+import org.broadinstitute.hellbender.utils.codecs.FeatureOutputCodec;
+import org.broadinstitute.hellbender.utils.codecs.FeatureOutputCodecFinder;
+import org.broadinstitute.hellbender.utils.codecs.FeatureSink;
+
+/**
+ * <p>Combines adjacent intervals in DepthEvidence files.</p>
+ *
+ * <h3>Inputs</h3>
+ *
+ * <ul>
+ *     <li>
+ *         A locus-sorted DepthEvidence file (name ends with ".rd.txt", ".rd.txt.gz", or "rd.bci").
+ *     </li>
+ * </ul>
+ *
+ * <h3>Output</h3>
+ *
+ * <ul>
+ *     <li>
+ *         An output file containing merged evidence from the inputs.
+ *     </li>
+ * </ul>
+ *
+ * <h3>Usage example</h3>
+ *
+ * <pre>
+ *     gatk CondenseDepthEvidence \
+ *       -F input.rd.txt.gz \
+ *       -O merged.rd.txt.gz
+ * </pre>
+ *
+ * @author Ted Sharpe &lt;tsharpe@broadinstitute.org&gt;
+ */
+@CommandLineProgramProperties(
+        summary = "Merges adjacent DepthEvidence records.",
+        oneLineSummary = "Merges adjacent DepthEvidence records.",
+        programGroup = StructuralVariantDiscoveryProgramGroup.class
+)
+@ExperimentalFeature
+public class CondenseDepthEvidence extends FeatureWalker<DepthEvidence> {
+    public static final String INPUT_ARGNAME = "depth-evidence";
+    public static final String COMPRESSION_LEVEL_ARGNAME = "compression-level";
+    public static final String MAX_INTERVAL_SIZE_ARGNAME = "max-interval-size";
+    public static final String MIN_INTERVAL_SIZE_ARGNAME = "min-interval-size";
+
+    @Argument(
+            doc = "DepthEvidence input file",
+            fullName = INPUT_ARGNAME,
+            shortName = StandardArgumentDefinitions.FEATURE_SHORT_NAME
+    )
+    private GATKPath inputPath;
+
+    @Argument(
+            doc = "Merged DepthEvidence output file",
+            fullName = StandardArgumentDefinitions.OUTPUT_LONG_NAME,
+            shortName = StandardArgumentDefinitions.OUTPUT_SHORT_NAME
+    )
+    private GATKPath outputPath;
+
+    @Argument(
+            doc = "Maximum interval size",
+            fullName = MAX_INTERVAL_SIZE_ARGNAME,
+            optional = true
+    )
+    private int maxIntervalLength = 1000;
+
+    @Argument(
+            doc = "Minimum interval size",
+            fullName = MIN_INTERVAL_SIZE_ARGNAME,
+            optional = true
+    )
+    private int minIntervalLength = 0;
+
+    @Argument(
+            doc = "Output compression level",
+            fullName = COMPRESSION_LEVEL_ARGNAME,
+            minValue = 0, maxValue = 9, optional = true
+    )
+    private int compressionLevel = 4;
+
+    private FeatureSink<DepthEvidence> outputSink;
+    private DepthEvidence accumulator;
+
+
+    @Override
+    public GATKPath getDrivingFeaturePath() {
+        return inputPath;
+    }
+
+    @Override
+    protected boolean isAcceptableFeatureType( final Class<? extends Feature> featureType ) {
+        return featureType.equals(DepthEvidence.class);
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public void onTraversalStart() {
+        super.onTraversalStart();
+
+        if ( minIntervalLength > maxIntervalLength ) {
+            throw new UserException("Minimum interval length exceeds maximum interval length.");
+        }
+
+        final FeatureOutputCodec<? extends Feature, ? extends FeatureSink<? extends Feature>> codec =
+                FeatureOutputCodecFinder.find(outputPath);
+        final Class<? extends Feature> codecFeatureClass = codec.getFeatureType();
+        if ( !codecFeatureClass.equals(DepthEvidence.class) ) {
+            throw new UserException("Output file " + outputPath + " implies Feature subtype " +
+                    codecFeatureClass.getSimpleName() +
+                    ", but this tool expects to write DepthEvidence.");
+        }
+        final SVFeaturesHeader header = (SVFeaturesHeader)getDrivingFeaturesHeader();
+        final SAMSequenceDictionary dict =
+                header.getDictionary() != null ? header.getDictionary() : getBestAvailableSequenceDictionary();
+        outputSink = (FeatureSink<DepthEvidence>)codec.makeSink(outputPath, dict,
+                                                        header.getSampleNames(), compressionLevel);
+    }
+
+    @Override
+    public void apply( final DepthEvidence feature,
+                       final ReadsContext readsContext,
+                       final ReferenceContext referenceContext,
+                       final FeatureContext featureContext ) {
+        if ( accumulator == null ) {
+            accumulator = feature;
+            return;
+        }
+        final int intervalLength = accumulator.getLengthOnReference();
+        if ( !isAdjacent(accumulator, feature) || intervalLength >= maxIntervalLength ) {
+            if ( intervalLength >= minIntervalLength ) {
+                outputSink.write(accumulator);
+            }
+            accumulator = feature;
+            return;
+        }
+        final int[] accumCounts = accumulator.getCounts();
+        MathUtils.addToArrayInPlace(accumCounts, feature.getCounts());
+        accumulator = new DepthEvidence(feature.getContig(), accumulator.getStart(),
+                                            feature.getEnd(), accumCounts);
+    }
+
+    @Override
+    public Object onTraversalSuccess() {
+        super.onTraversalSuccess();
+        if ( accumulator != null && accumulator.getLengthOnReference() >= minIntervalLength ) {
+            outputSink.write(accumulator);
+        }
+        outputSink.close();
+        return null;
+    }
+
+    private static boolean isAdjacent( final DepthEvidence ev1, final DepthEvidence ev2 ) {
+        return ev1.getContig().equals(ev2.getContig()) && ev1.getEnd() + 1 == ev2.getStart();
+    }
+}
diff --git a/src/main/java/org/broadinstitute/hellbender/utils/io/FeatureOutputStream.java b/src/main/java/org/broadinstitute/hellbender/utils/io/FeatureOutputStream.java
index b4b0b0fba4d..c82a8384329 100644
--- a/src/main/java/org/broadinstitute/hellbender/utils/io/FeatureOutputStream.java
+++ b/src/main/java/org/broadinstitute/hellbender/utils/io/FeatureOutputStream.java
@@ -108,11 +108,11 @@ public void write(final F feature) {
     @Override
     public void close() {
         try {
+            outputStream.close(); // do this first so that the timestamp on the index will be later
             if (indexCreator != null) {
                 final Index index = indexCreator.finalizeIndex(locationAware.getPosition());
                 index.writeBasedOnFeaturePath(featurePath);
             }
-            outputStream.close();
         } catch (final IOException e) {
             throw new GATKException("Error closing output", e);
         }
diff --git a/src/test/java/org/broadinstitute/hellbender/tools/sv/CondenseDepthEvidenceIntegrationTest.java b/src/test/java/org/broadinstitute/hellbender/tools/sv/CondenseDepthEvidenceIntegrationTest.java
new file mode 100644
index 00000000000..6c749582b2c
--- /dev/null
+++ b/src/test/java/org/broadinstitute/hellbender/tools/sv/CondenseDepthEvidenceIntegrationTest.java
@@ -0,0 +1,48 @@
+package org.broadinstitute.hellbender.tools.sv;
+
+import htsjdk.samtools.SAMSequenceDictionary;
+import htsjdk.samtools.util.Log;
+import org.broadinstitute.hellbender.CommandLineProgramTest;
+import org.broadinstitute.hellbender.cmdline.StandardArgumentDefinitions;
+import org.broadinstitute.hellbender.testutils.ArgumentsBuilder;
+import org.broadinstitute.hellbender.testutils.IntegrationTestSpec;
+import org.testng.annotations.Test;
+
+import java.io.IOException;
+import java.util.Collections;
+
+public class CondenseDepthEvidenceIntegrationTest  extends CommandLineProgramTest {
+    public static final String printEvidenceTestDir = toolsTestDir + "walkers/sv/printevidence/";
+    public static final String sequenceDict = largeFileTestDir + "human_g1k_v37.20.21.dict";
+
+    @Test
+    public void positiveTest() throws IOException {
+        final ArgumentsBuilder argsBuilder = new ArgumentsBuilder();
+        argsBuilder.add(StandardArgumentDefinitions.VERBOSITY_NAME, Log.LogLevel.ERROR.name());
+        argsBuilder.add(StandardArgumentDefinitions.SEQUENCE_DICTIONARY_NAME, sequenceDict);
+        argsBuilder.add(CondenseDepthEvidence.MIN_INTERVAL_SIZE_ARGNAME, 101);
+        argsBuilder.add(StandardArgumentDefinitions.FEATURE_SHORT_NAME, printEvidenceTestDir + "output.test_hg38.rd.txt");
+        argsBuilder.add(StandardArgumentDefinitions.OUTPUT_SHORT_NAME, "%s");
+        final IntegrationTestSpec testSpec =
+                new IntegrationTestSpec(argsBuilder.getString(),
+                        Collections.singletonList(printEvidenceTestDir + "merged.rd.txt"));
+        testSpec.setOutputFileExtension("rd.txt");
+        testSpec.executeTest("positive test", this);
+    }
+
+    @Test
+    public void negativeTest() throws IOException {
+        final ArgumentsBuilder argsBuilder = new ArgumentsBuilder();
+        argsBuilder.add(StandardArgumentDefinitions.VERBOSITY_NAME, Log.LogLevel.ERROR.name());
+        argsBuilder.add(StandardArgumentDefinitions.SEQUENCE_DICTIONARY_NAME, sequenceDict);
+        argsBuilder.add(StandardArgumentDefinitions.FEATURE_SHORT_NAME, printEvidenceTestDir + "no_condense.rd.txt");
+        argsBuilder.add(StandardArgumentDefinitions.OUTPUT_SHORT_NAME, "%s");
+
+        // output equal to input, because this file contains rows that can't be merged for various reasons
+        final IntegrationTestSpec testSpec =
+                new IntegrationTestSpec(argsBuilder.getString(),
+                        Collections.singletonList(printEvidenceTestDir + "no_condense.rd.txt"));
+        testSpec.setOutputFileExtension("rd.txt");
+        testSpec.executeTest("negative test", this);
+    }
+}
diff --git a/src/test/resources/org/broadinstitute/hellbender/tools/walkers/sv/printevidence/merged.rd.txt b/src/test/resources/org/broadinstitute/hellbender/tools/walkers/sv/printevidence/merged.rd.txt
new file mode 100644
index 00000000000..76a3ba97cd0
--- /dev/null
+++ b/src/test/resources/org/broadinstitute/hellbender/tools/walkers/sv/printevidence/merged.rd.txt
@@ -0,0 +1,51 @@
+#Chr	Start	End	HG00096	HG00129	HG00140
+chr22	30499964	30500964	217	182	243
+chr22	30500964	30501964	242	175	218
+chr22	30501964	30502964	244	220	261
+chr22	30502964	30503964	261	223	243
+chr22	30503964	30504964	224	204	234
+chr22	30504964	30505964	313	217	307
+chr22	30505964	30506964	241	197	247
+chr22	30506964	30507964	240	226	238
+chr22	30507964	30508964	295	240	262
+chr22	30508964	30509964	234	179	206
+chr22	30509964	30510964	212	214	250
+chr22	30510964	30511964	243	210	247
+chr22	30511964	30512964	263	206	231
+chr22	30512964	30513964	235	202	231
+chr22	30513964	30514964	286	237	290
+chr22	30514964	30515964	252	208	241
+chr22	30515964	30516964	192	203	200
+chr22	30516964	30517964	253	185	225
+chr22	30517964	30518964	226	188	243
+chr22	30518964	30519964	208	166	204
+chr22	30519964	30520964	253	230	202
+chr22	30520964	30521964	252	279	257
+chr22	30521964	30522964	229	189	229
+chr22	30522964	30523964	234	201	235
+chr22	30523964	30524964	270	217	215
+chr22	30524964	30525964	313	239	267
+chr22	30525964	30526964	301	202	245
+chr22	30526964	30527964	206	237	223
+chr22	30527964	30528964	260	203	272
+chr22	30528964	30529964	248	195	295
+chr22	30529964	30530964	239	193	241
+chr22	30530964	30531964	267	236	265
+chr22	30531964	30532964	306	238	317
+chr22	30532964	30533964	283	238	274
+chr22	30533964	30534964	243	177	294
+chr22	30534964	30535964	257	220	287
+chr22	30535964	30536964	229	204	210
+chr22	30536964	30537964	275	210	275
+chr22	30537964	30538964	201	227	193
+chr22	30538964	30539964	243	219	234
+chr22	30539964	30540964	263	213	250
+chr22	30540964	30541964	270	242	261
+chr22	30541964	30542964	281	197	254
+chr22	30542964	30543964	271	197	249
+chr22	30543964	30544964	233	226	246
+chr22	30544964	30545964	245	210	233
+chr22	30545964	30546964	218	149	229
+chr22	30546964	30547964	250	165	287
+chr22	30547964	30548964	241	215	243
+chr22	30548964	30549964	262	248	285
diff --git a/src/test/resources/org/broadinstitute/hellbender/tools/walkers/sv/printevidence/no_condense.rd.txt b/src/test/resources/org/broadinstitute/hellbender/tools/walkers/sv/printevidence/no_condense.rd.txt
new file mode 100644
index 00000000000..86b5ed4f2fb
--- /dev/null
+++ b/src/test/resources/org/broadinstitute/hellbender/tools/walkers/sv/printevidence/no_condense.rd.txt
@@ -0,0 +1,7 @@
+#Chr	Start	End	HG00096	HG00129	HG00140
+chr20	30499964	30500964	217	182	243
+chr20	30500963	30501964	242	175	218
+chr20	30501965	30502964	244	220	261
+chr21	30502964	30503964	261	223	243
+chr21	30504000	30505000	261	223	243
+chr21	30505000	30506000	261	223	243