This study investigates the prosodic cues involved in the disambiguation of English relative clauses (RCs). For example, in the sentence “The reporter interviewed the daughter of the senator who was controversial,” the underlined RC can modify the higher noun “daughter” or the lower noun ‘senator, thus having a high attachment (HA) or low attachment (LA) interpretation. Prior work shows that prosody influences the interpretation of ambiguous structures (Lehiste, 1973; Nespor & Vogel, 1983) but does not examine specific acoustic cues distinguishing between RC interpretations. An elicited production task was conducted involving 40 target HA and LA RCs. Intermediate boundaries at the higher and lower nouns were examined for prosodic phrasing cues including pauses, syllable lengthening, boundary tones, and final creak. Delaying of prenuclear peaks was also considered. Data from 8 speakers show that 70% of HA utterances contained two intermediate boundaries, compared to 57% of LA utterances. Main results show that the majority of first intermediate boundaries were high (H-) (81% for LA, 70% for HA), while second intermediate boundaries were usually low (L-) (78% for LA, 73% for HA). In addition, LA interpretations had prenuclear delayed peaks on the higher nouns more often (50% vs. 36% of HA cases).